The source code

    /*!
     * Ext JS Library 3.4.0
     * Copyright(c) 2006-2011 Sencha Inc.
     * licensing@sencha.com
     * http://www.sencha.com/license
     */
    /**
     * @class Ext.Panel
     * @extends Ext.Container
     * Panel is a container that has specific functionality and structural components that make
     * it the perfect building block for application-oriented user interfaces.
     * Panels are, by virtue of their inheritance from {@link Ext.Container}, capable
     * of being configured with a {@link Ext.Container#layout layout}, and containing child Components.
     * When either specifying child {@link Ext.Component#items items} of a Panel, or dynamically {@link Ext.Container#add adding} Components
     * to a Panel, remember to consider how you wish the Panel to arrange those child elements, and whether
     * those child elements need to be sized using one of Ext's built-in {@link Ext.Container#layout layout} schemes. By
     * default, Panels use the {@link Ext.layout.ContainerLayout ContainerLayout} scheme. This simply renders
     * child components, appending them one after the other inside the Container, and does not apply any sizing
     * at all.
     * A Panel may also contain {@link #bbar bottom} and {@link #tbar top} toolbars, along with separate
     * {@link #header}, {@link #footer} and {@link #body} sections (see {@link #frame} for additional
     * information).
     * Panel also provides built-in {@link #collapsible expandable and collapsible behavior}, along with
     * a variety of {@link #tools prebuilt tool buttons} that can be wired up to provide other customized
     * behavior.  Panels can be easily dropped into any {@link Ext.Container Container} or layout, and the
     * layout and rendering pipeline is {@link Ext.Container#add completely managed by the framework}.
     * @constructor
     * @param {Object} config The config object
     * @xtype panel
     */
    Ext.Panel = Ext.extend(Ext.Container, {
        /**
         * The Panel's header {@link Ext.Element Element}. Read-only.
         * This Element is used to house the {@link #title} and {@link #tools}
         *
    Note: see the Note for {@link Ext.Component#el el} also.
         * @type Ext.Element
         * @property header
         */
        /**
         * The Panel's body {@link Ext.Element Element} which may be used to contain HTML content.
         * The content may be specified in the {@link #html} config, or it may be loaded using the
         * {@link autoLoad} config, or through the Panel's {@link #getUpdater Updater}. Read-only.
         * If this is used to load visible HTML elements in either way, then
         * the Panel may not be used as a Layout for hosting nested Panels.
         * If this Panel is intended to be used as the host of a Layout (See {@link #layout}
         * then the body Element must not be loaded or changed - it is under the control
         * of the Panel's Layout.
         *
    Note: see the Note for {@link Ext.Component#el el} also.
         * @type Ext.Element
         * @property body
         */
        /**
         * The Panel's bwrap {@link Ext.Element Element} used to contain other Panel elements
         * (tbar, body, bbar, footer). See {@link #bodyCfg}. Read-only.
         * @type Ext.Element
         * @property bwrap
         */
        /**
         * True if this panel is collapsed. Read-only.
         * @type Boolean
         * @property collapsed
         */
        /**
         * @cfg {Object} bodyCfg
         * A {@link Ext.DomHelper DomHelper} element specification object may be specified for any
         * Panel Element.
         * By default, the Default element in the table below will be used for the html markup to
         * create a child element with the commensurate Default class name (baseCls will be
         * replaced by {@link #baseCls}):
         *
         * Panel      Default  Default             Custom      Additional       Additional
         * Element    element  class               element     class            style
         * ========   ==========================   =========   ==============   ===========
         * {@link #header}     div      {@link #baseCls}+'-header'   {@link #headerCfg}   headerCssClass   headerStyle
         * {@link #bwrap}      div      {@link #baseCls}+'-bwrap'     {@link #bwrapCfg}    bwrapCssClass    bwrapStyle
         * + tbar     div      {@link #baseCls}+'-tbar'       {@link #tbarCfg}     tbarCssClass     tbarStyle
         * + {@link #body}     div      {@link #baseCls}+'-body'       {@link #bodyCfg}     {@link #bodyCssClass}     {@link #bodyStyle}
         * + bbar     div      {@link #baseCls}+'-bbar'       {@link #bbarCfg}     bbarCssClass     bbarStyle
         * + {@link #footer}   div      {@link #baseCls}+'-footer'   {@link #footerCfg}   footerCssClass   footerStyle
         *
         * Configuring a Custom element may be used, for example, to force the {@link #body} Element
         * to use a different form of markup than is created by default. An example of this might be
         * to {@link Ext.Element#createChild create a child} Panel containing a custom content, such as
         * a header, or forcing centering of all Panel content by having the body be a <center>
         * element:
         *
    new Ext.Panel({
        title: 'Message Title',
        renderTo: Ext.getBody(),
        width: 200, height: 130,
        bodyCfg: {
            tag: 'center',
            cls: 'x-panel-body',  // Default class not applied if Custom element specified
            html: 'Message'
        },
        footerCfg: {
            tag: 'h2',
            cls: 'x-panel-footer',        // same as the Default class
            html: 'footer html'
        },
        footerCssClass: 'custom-footer', // additional css class, see {@link Ext.element#addClass addClass}
        footerStyle:    'background-color:red' // see {@link #bodyStyle}
    });
         *
         * The example above also explicitly creates a {@link #footer} with custom markup and
         * styling applied.
         */
        /**
         * @cfg {Object} headerCfg
         * A {@link Ext.DomHelper DomHelper} element specification object specifying the element structure
         * of this Panel's {@link #header} Element.  See {@link #bodyCfg} also.
         */
        /**
         * @cfg {Object} bwrapCfg
         * A {@link Ext.DomHelper DomHelper} element specification object specifying the element structure
         * of this Panel's {@link #bwrap} Element.  See {@link #bodyCfg} also.
         */
        /**
         * @cfg {Object} tbarCfg
         * A {@link Ext.DomHelper DomHelper} element specification object specifying the element structure
         * of this Panel's {@link #tbar} Element.  See {@link #bodyCfg} also.
         */
        /**
         * @cfg {Object} bbarCfg
         * A {@link Ext.DomHelper DomHelper} element specification object specifying the element structure
         * of this Panel's {@link #bbar} Element.  See {@link #bodyCfg} also.
         */
        /**
         * @cfg {Object} footerCfg
         * A {@link Ext.DomHelper DomHelper} element specification object specifying the element structure
         * of this Panel's {@link #footer} Element.  See {@link #bodyCfg} also.
         */
        /**
         * @cfg {Boolean} closable
         * Panels themselves do not directly support being closed, but some Panel subclasses do (like
         * {@link Ext.Window}) or a Panel Class within an {@link Ext.TabPanel}.  Specify true
         * to enable closing in such situations. Defaults to false.
         */
        /**
         * The Panel's footer {@link Ext.Element Element}. Read-only.
         * This Element is used to house the Panel's {@link #buttons} or {@link #fbar}.
         *
    Note: see the Note for {@link Ext.Component#el el} also.
         * @type Ext.Element
         * @property footer
         */
        /**
         * @cfg {Mixed} applyTo
         * The id of the node, a DOM node or an existing Element corresponding to a DIV that is already present in
         * the document that specifies some panel-specific structural markup.  When applyTo is used,
         * constituent parts of the panel can be specified by CSS class name within the main element, and the panel
         * will automatically create those components from that markup. Any required components not specified in the
         * markup will be autogenerated if necessary.
         * The following class names are supported (baseCls will be replaced by {@link #baseCls}):
         * baseCls + '-header'
         * baseCls + '-header-text'
         * baseCls + '-bwrap'
         * baseCls + '-tbar'
         * baseCls + '-body'
         * baseCls + '-bbar'
         * baseCls + '-footer'
         * Using this config, a call to render() is not required.  If applyTo is specified, any value passed for
         * {@link #renderTo} will be ignored and the target element's parent node will automatically be used as the
         * panel's container.
         */
        /**
         * @cfg {Object/Array} tbar
         * The top toolbar of the panel. This can be a {@link Ext.Toolbar} object, a toolbar config, or an array of
         * buttons/button configs to be added to the toolbar.  Note that this is not available as a property after render.
         * To access the top toolbar after render, use {@link #getTopToolbar}.
         * Note: Although a Toolbar may contain Field components, these will not be updated by a load
         * of an ancestor FormPanel. A Panel's toolbars are not part of the standard Container->Component hierarchy, and
         * so are not scanned to collect form items. However, the values will be submitted because form
         * submission parameters are collected from the DOM tree.
         */
        /**
         * @cfg {Object/Array} bbar
         * The bottom toolbar of the panel. This can be a {@link Ext.Toolbar} object, a toolbar config, or an array of
         * buttons/button configs to be added to the toolbar.  Note that this is not available as a property after render.
         * To access the bottom toolbar after render, use {@link #getBottomToolbar}.
         * Note: Although a Toolbar may contain Field components, these will not be updated by a load
         * of an ancestor FormPanel. A Panel's toolbars are not part of the standard Container->Component hierarchy, and
         * so are not scanned to collect form items. However, the values will be submitted because form
         * submission parameters are collected from the DOM tree.
         */
        /** @cfg {Object/Array} fbar
         * A {@link Ext.Toolbar Toolbar} object, a Toolbar config, or an array of
         * {@link Ext.Button Button}s/{@link Ext.Button Button} configs, describing a {@link Ext.Toolbar Toolbar} to be rendered into this Panel's footer element.
         * After render, the fbar property will be an {@link Ext.Toolbar Toolbar} instance.
         * If {@link #buttons} are specified, they will supersede the fbar configuration property.
         * The Panel's {@link #buttonAlign} configuration affects the layout of these items, for example:
         *
    var w = new Ext.Window({
        height: 250,
        width: 500,
        bbar: new Ext.Toolbar({
            items: [{
                text: 'bbar Left'
            },'->',{
                text: 'bbar Right'
            }]
        }),
        {@link #buttonAlign}: 'left', // anything but 'center' or 'right' and you can use '-', and '->'
                                      // to control the alignment of fbar items
        fbar: [{
            text: 'fbar Left'
        },'->',{
            text: 'fbar Right'
        }]
    }).show();
         *
         * Note: Although a Toolbar may contain Field components, these will not be updated by a load
         * of an ancestor FormPanel. A Panel's toolbars are not part of the standard Container->Component hierarchy, and
         * so are not scanned to collect form items. However, the values will be submitted because form
         * submission parameters are collected from the DOM tree.
         */
        /**
         * @cfg {Boolean} header
         * true to create the Panel's header element explicitly, false to skip creating
         * it.  If a {@link #title} is set the header will be created automatically, otherwise it will not.
         * If a {@link #title} is set but header is explicitly set to false, the header
         * will not be rendered.
         */
        /**
         * @cfg {Boolean} footer
         * true to create the footer element explicitly, false to skip creating it. The footer
         * will be created automatically if {@link #buttons} or a {@link #fbar} have
         * been configured.  See {@link #bodyCfg} for an example.
         */
        /**
         * @cfg {String} title
         * The title text to be used as innerHTML (html tags are accepted) to display in the panel
         * {@link #header} (defaults to ''). When a title is specified the
         * {@link #header} element will automatically be created and displayed unless
         * {@link #header} is explicitly set to false.  If you do not want to specify a
         * title at config time, but you may want one later, you must either specify a non-empty
         * title (a blank space ' ' will do) or header:true so that the container
         * element will get created.
         */
        /**
         * @cfg {Array} buttons
         * buttons will be used as {@link Ext.Container#items items} for the toolbar in
         * the footer ({@link #fbar}). Typically the value of this configuration property will be
         * an array of {@link Ext.Button}s or {@link Ext.Button} configuration objects.
         * If an item is configured with minWidth or the Panel is configured with minButtonWidth,
         * that width will be applied to the item.
         */
        /**
         * @cfg {Object/String/Function} autoLoad
         * A valid url spec according to the Updater {@link Ext.Updater#update} method.
         * If autoLoad is not null, the panel will attempt to load its contents
         * immediately upon render.
         * The URL will become the default URL for this panel's {@link #body} element,
         * so it may be {@link Ext.Element#refresh refresh}ed at any time.
         */
        /**
         * @cfg {Boolean} frame
         * false by default to render with plain 1px square borders. true to render with
         * 9 elements, complete with custom rounded corners (also see {@link Ext.Element#boxWrap}).
         * The template generated for each condition is depicted below:
         *
    // frame = false
    <div id="developer-specified-id-goes-here" class="x-panel">

        <div class="x-panel-header"><span class="x-panel-header-text">Title: (frame:false)</span></div>

        <div class="x-panel-bwrap">
            <div class="x-panel-body"><p>html value goes here</p></div>
        </div>
    </div>

    // frame = true (create 9 elements)
    <div id="developer-specified-id-goes-here" class="x-panel">
        <div class="x-panel-tl"><div class="x-panel-tr"><div class="x-panel-tc">
            <div class="x-panel-header"><span class="x-panel-header-text">Title: (frame:true)</span></div>
        </div></div></div>

        <div class="x-panel-bwrap">
            <div class="x-panel-ml"><div class="x-panel-mr"><div class="x-panel-mc">
                <div class="x-panel-body"><p>html value goes here</p></div>
            </div></div></div>

            <div class="x-panel-bl"><div class="x-panel-br"><div class="x-panel-bc"/>
            </div></div></div>
    </div>
         *
         */
        /**
         * @cfg {Boolean} border
         * True to display the borders of the panel's body element, false to hide them (defaults to true).  By default,
         * the border is a 2px wide inset border, but this can be further altered by setting {@link #bodyBorder} to false.
         */
        /**
         * @cfg {Boolean} bodyBorder
         * True to display an interior border on the body element of the panel, false to hide it (defaults to true).
         * This only applies when {@link #border} == true.  If border == true and bodyBorder == false, the border will display
         * as a 1px wide inset border, giving the entire body element an inset appearance.
         */
        /**
         * @cfg {String/Object/Function} bodyCssClass
         * Additional css class selector to be applied to the {@link #body} element in the format expected by
         * {@link Ext.Element#addClass} (defaults to null). See {@link #bodyCfg}.
         */
        /**
         * @cfg {String/Object/Function} bodyStyle
         * Custom CSS styles to be applied to the {@link #body} element in the format expected by
         * {@link Ext.Element#applyStyles} (defaults to null). See {@link #bodyCfg}.
         */
        /**
         * @cfg {String} iconCls
         * The CSS class selector that specifies a background image to be used as the header icon (defaults to '').
         * An example of specifying a custom icon class would be something like:
         *
    // specify the property in the config for the class:
         ...
         iconCls: 'my-icon'

    // css class that specifies background image to be used as the icon image:
    .my-icon { background-image: url(../images/my-icon.gif) 0 6px no-repeat !important; }

         */
        /**
         * @cfg {Boolean} collapsible
         * True to make the panel collapsible and have the expand/collapse toggle button automatically rendered into
         * the header tool button area, false to keep the panel statically sized with no button (defaults to false).
         */
        /**
         * @cfg {Array} tools
         * An array of tool button configs to be added to the header tool area. When rendered, each tool is
         * stored as an {@link Ext.Element Element} referenced by a public property called tools.<tool-type>
         * Each tool config may contain the following properties:
         *
         * id : StringRequired. The type
         * of tool to create. By default, this assigns a CSS class of the form x-tool-<tool-type> to the
         * resulting tool Element. Ext provides CSS rules, and an icon sprite containing images for the tool types listed below.
         * The developer may implement custom tools by supplying alternate CSS rules and background images:
         *
         *   toggle (Created by default when {@link #collapsible} is true)
         *   close
         *   minimize
         *   maximize
         *   restore
         *   gear
         *   pin
         *   unpin
         *   right
         *   left
         *   up
         *   down
         *   refresh
         *   minus
         *   plus
         *   help
         *   search
         *   save
         *   print
         *
         * handler : FunctionRequired. The function to
         * call when clicked. Arguments passed are:
         * event : Ext.EventObjectThe click event.
         * toolEl : Ext.ElementThe tool Element.
         * panel : Ext.PanelThe host Panel
         * tc : ObjectThe tool configuration object
         *
         * stopEvent : BooleanDefaults to true. Specify as false to allow click event to propagate.
         * scope : ObjectThe scope in which to call the handler.
         * qtip : String/ObjectA tip string, or
         * a config argument to {@link Ext.QuickTip#register}
         * hidden : BooleanTrue to initially render hidden.
         * on : ObjectA listener config object specifiying
         * event listeners in the format of an argument to {@link #addListener}
         *
         * Note that, apart from the toggle tool which is provided when a panel is collapsible, these
         * tools only provide the visual button. Any required functionality must be provided by adding
         * handlers that implement the necessary behavior.
         * Example usage:
         *
    tools:[{
        id:'refresh',
        qtip: 'Refresh form Data',
        // hidden:true,
        handler: function(event, toolEl, panel){
            // refresh logic
        }
    },
    {
        id:'help',
        qtip: 'Get Help',
        handler: function(event, toolEl, panel){
            // whatever
        }
    }]

         * For the custom id of 'help' define two relevant css classes with a link to
         * a 15x15 image:
         *
    .x-tool-help {background-image: url(images/help.png);}
    .x-tool-help-over {background-image: url(images/help_over.png);}
    // if using an image sprite:
    .x-tool-help {background-image: url(images/help.png) no-repeat 0 0;}
    .x-tool-help-over {background-position:-15px 0;}

         */
        /**
         * @cfg {Ext.Template/Ext.XTemplate} toolTemplate
         * A Template used to create {@link #tools} in the {@link #header} Element. Defaults to:
    new Ext.Template('<div class="x-tool x-tool-{id}">&#160;</div>')
         * This may may be overridden to provide a custom DOM structure for tools based upon a more
         * complex XTemplate. The template's data is a single tool configuration object (Not the entire Array)
         * as specified in {@link #tools}.  In the following example an <a> tag is used to provide a
         * visual indication when hovering over the tool:
    var win = new Ext.Window({
        tools: [{
            id: 'download',
            href: '/MyPdfDoc.pdf'
        }],
        toolTemplate: new Ext.XTemplate(
            '<tpl if="id==\'download\'">',
                '<a class="x-tool x-tool-pdf" href="{href}"></a>',
            '</tpl>',
            '<tpl if="id!=\'download\'">',
                '<div class="x-tool x-tool-{id}">&#160;</div>',
            '</tpl>'
        ),
        width:500,
        height:300,
        closeAction:'hide'
    });
         * Note that the CSS class 'x-tool-pdf' should have an associated style rule which provides an
         * appropriate background image, something like:

        a.x-tool-pdf {background-image: url(../shared/extjs/images/pdf.gif)!important;}

         */
        /**
         * @cfg {Boolean} hideCollapseTool
         * true to hide the expand/collapse toggle button when {@link #collapsible} == true,
         * false to display it (defaults to false).
         */
        /**
         * @cfg {Boolean} titleCollapse
         * true to allow expanding and collapsing the panel (when {@link #collapsible} = true)
         * by clicking anywhere in the header bar, false) to allow it only by clicking to tool button
         * (defaults to false)). If this panel is a child item of a border layout also see the
         * {@link Ext.layout.BorderLayout.Region BorderLayout.Region}
         * {@link Ext.layout.BorderLayout.Region#floatable floatable} config option.
         */

        /**
         * @cfg {Mixed} floating
         * This property is used to configure the underlying {@link Ext.Layer}. Acceptable values for this
         * configuration property are:
         * false : Default.Display the panel inline where it is
         * rendered.
         * true : Float the panel (absolute position it with automatic
         * shimming and shadow).
         * Setting floating to true will create an Ext.Layer for this panel and display the
         * panel at negative offsets so that it is hidden.
         * Since the panel will be absolute positioned, the position must be set explicitly
         * after render (e.g., myPanel.setPosition(100,100);).
         * Note: when floating a panel you should always assign a fixed width,
         * otherwise it will be auto width and will expand to fill to the right edge of the viewport.
         *
         * {@link Ext.Layer object} : The specified object will be used
         * as the configuration object for the {@link Ext.Layer} that will be created.
         *
         */
        /**
         * @cfg {Boolean/String} shadow
         * true (or a valid Ext.Shadow {@link Ext.Shadow#mode} value) to display a shadow behind the
         * panel, false to display no shadow (defaults to 'sides').  Note that this option
         * only applies when {@link #floating} = true.
         */
        /**
         * @cfg {Number} shadowOffset
         * The number of pixels to offset the shadow if displayed (defaults to 4). Note that this
         * option only applies when {@link #floating} = true.
         */
        /**
         * @cfg {Boolean} shim
         * false to disable the iframe shim in browsers which need one (defaults to true).
         * Note that this option only applies when {@link #floating} = true.
         */
        /**
         * @cfg {Object/Array} keys
         * A {@link Ext.KeyMap} config object (in the format expected by {@link Ext.KeyMap#addBinding}
         * used to assign custom key handling to this panel (defaults to null).
         */
        /**
         * @cfg {Boolean/Object} draggable
         * true to enable dragging of this Panel (defaults to false).
         * For custom drag/drop implementations, an Ext.Panel.DD config could also be passed
         * in this config instead of true. Ext.Panel.DD is an internal, undocumented class which
         * moves a proxy Element around in place of the Panel's element, but provides no other behaviour
         * during dragging or on drop. It is a subclass of {@link Ext.dd.DragSource}, so behaviour may be
         * added by implementing the interface methods of {@link Ext.dd.DragDrop} e.g.:
         *
    new Ext.Panel({
        title: 'Drag me',
        x: 100,
        y: 100,
        renderTo: Ext.getBody(),
        floating: true,
        frame: true,
        width: 400,
        height: 200,
        draggable: {
    //      Config option of Ext.Panel.DD class.
    //      It's a floating Panel, so do not show a placeholder proxy in the original position.
            insertProxy: false,

    //      Called for each mousemove event while dragging the DD object.
            onDrag : function(e){
    //          Record the x,y position of the drag proxy so that we can
    //          position the Panel at end of drag.
                var pel = this.proxy.getEl();
                this.x = pel.getLeft(true);
                this.y = pel.getTop(true);

    //          Keep the Shadow aligned if there is one.
                var s = this.panel.getEl().shadow;
                if (s) {
                    s.realign(this.x, this.y, pel.getWidth(), pel.getHeight());
                }
            },

    //      Called on the mouseup event.
            endDrag : function(e){
                this.panel.setPosition(this.x, this.y);
            }
        }
    }).show();

         */
        /**
         * @cfg {Boolean} disabled
         * Render this panel disabled (default is false). An important note when using the disabled
         * config on panels is that IE will often fail to initialize the disabled mask element correectly if
         * the panel's layout has not yet completed by the time the Panel is disabled during the render process.
         * If you experience this issue, you may need to instead use the {@link #afterlayout} event to initialize
         * the disabled state:
         *
    new Ext.Panel({
        ...
        listeners: {
            'afterlayout': {
                fn: function(p){
                    p.disable();
                },
                single: true // important, as many layouts can occur
            }
        }
    });

         */
        /**
         * @cfg {Boolean} autoHeight
         * true to use height:'auto', false to use fixed height (defaults to false).
         * Note: Setting autoHeight: true means that the browser will manage the panel's height
         * based on its contents, and that Ext will not manage it at all. If the panel is within a layout that
         * manages dimensions (fit, border, etc.) then setting autoHeight: true
         * can cause issues with scrolling and will not generally work as expected since the panel will take
         * on the height of its contents rather than the height required by the Ext layout.
         */

        /**
         * @cfg {String} baseCls
         * The base CSS class to apply to this panel's element (defaults to 'x-panel').
         * Another option available by default is to specify 'x-plain' which strips all styling
         * except for required attributes for Ext layouts to function (e.g. overflow:hidden).
         * See {@link #unstyled} also.
         */
        baseCls : 'x-panel',
        /**
         * @cfg {String} collapsedCls
         * A CSS class to add to the panel's element after it has been collapsed (defaults to
         * 'x-panel-collapsed').
         */
        collapsedCls : 'x-panel-collapsed',
        /**
         * @cfg {Boolean} maskDisabled
         * true to mask the panel when it is {@link #disabled}, false to not mask it (defaults
         * to true).  Either way, the panel will always tell its contained elements to disable themselves
         * when it is disabled, but masking the panel can provide an additional visual cue that the panel is
         * disabled.
         */
        maskDisabled : true,
        /**
         * @cfg {Boolean} animCollapse
         * true to animate the transition when the panel is collapsed, false to skip the
         * animation (defaults to true if the {@link Ext.Fx} class is available, otherwise false).
         */
        animCollapse : Ext.enableFx,
        /**
         * @cfg {Boolean} headerAsText
         * true to display the panel {@link #title} in the {@link #header},
         * false to hide it (defaults to true).
         */
        headerAsText : true,
        /**
         * @cfg {String} buttonAlign
         * The alignment of any {@link #buttons} added to this panel.  Valid values are 'right',
         * 'left' and 'center' (defaults to 'right').
         */
        buttonAlign : 'right',
        /**
         * @cfg {Boolean} collapsed
         * true to render the panel collapsed, false to render it expanded (defaults to
         * false).
         */
        collapsed : false,
        /**
         * @cfg {Boolean} collapseFirst
         * true to make sure the collapse/expand toggle button always renders first (to the left of)
         * any other tools in the panel's title bar, false to render it last (defaults to true).
         */
        collapseFirst : true,
        /**
         * @cfg {Number} minButtonWidth
         * Minimum width in pixels of all {@link #buttons} in this panel (defaults to 75)
         */
        minButtonWidth : 75,
        /**
         * @cfg {Boolean} unstyled
         * Overrides the {@link #baseCls} setting to {@link #baseCls} = 'x-plain' which renders
         * the panel unstyled except for required attributes for Ext layouts to function (e.g. overflow:hidden).
         */
        /**
         * @cfg {String} elements
         * A comma-delimited list of panel elements to initialize when the panel is rendered.  Normally, this list will be
         * generated automatically based on the items added to the panel at config time, but sometimes it might be useful to
         * make sure a structural element is rendered even if not specified at config time (for example, you may want
         * to add a button or toolbar dynamically after the panel has been rendered).  Adding those elements to this
         * list will allocate the required placeholders in the panel when it is rendered.  Valid values are
         * header
         * tbar (top bar)
         * body
         * bbar (bottom bar)
         * footer
         *
         * Defaults to 'body'.
         */
        elements : 'body',
        /**
         * @cfg {Boolean} preventBodyReset
         * Defaults to false.  When set to true, an extra css class 'x-panel-normal'
         * will be added to the panel's element, effectively applying css styles suggested by the W3C
         * (see http://www.w3.org/TR/CSS21/sample.html) to the Panel's body element (not the header,
         * footer, etc.).
         */
        preventBodyReset : false,

        /**
         * @cfg {Number/String} padding
         * A shortcut for setting a padding style on the body element. The value can either be
         * a number to be applied to all sides, or a normal css string describing padding.
         * Defaults to undefined.
         *
         */
        padding: undefined,

        /** @cfg {String} resizeEvent
         * The event to listen to for resizing in layouts. Defaults to 'bodyresize'.
         */
        resizeEvent: 'bodyresize',

        // protected - these could be used to customize the behavior of the window,
        // but changing them would not be useful without further mofifications and
        // could lead to unexpected or undesirable results.
        toolTarget : 'header',
        collapseEl : 'bwrap',
        slideAnchor : 't',
        disabledClass : '',

        // private, notify box this class will handle heights
        deferHeight : true,
        // private
        expandDefaults: {
            duration : 0.25
        },
        // private
        collapseDefaults : {
            duration : 0.25
        },

        // private
        initComponent : function(){
            Ext.Panel.superclass.initComponent.call(this);

            this.addEvents(
                /**
                 * @event bodyresize
                 * Fires after the Panel has been resized.
                 * @param {Ext.Panel} p the Panel which has been resized.
                 * @param {Number} width The Panel body's new width.
                 * @param {Number} height The Panel body's new height.
                 */
                'bodyresize',
                /**
                 * @event titlechange
                 * Fires after the Panel title has been {@link #title set} or {@link #setTitle changed}.
                 * @param {Ext.Panel} p the Panel which has had its title changed.
                 * @param {String} The new title.
                 */
                'titlechange',
                /**
                 * @event iconchange
                 * Fires after the Panel icon class has been {@link #iconCls set} or {@link #setIconClass changed}.
                 * @param {Ext.Panel} p the Panel which has had its {@link #iconCls icon class} changed.
                 * @param {String} The new icon class.
                 * @param {String} The old icon class.
                 */
                'iconchange',
                /**
                 * @event collapse
                 * Fires after the Panel has been collapsed.
                 * @param {Ext.Panel} p the Panel that has been collapsed.
                 */
                'collapse',
                /**
                 * @event expand
                 * Fires after the Panel has been expanded.
                 * @param {Ext.Panel} p The Panel that has been expanded.
                 */
                'expand',
                /**
                 * @event beforecollapse
                 * Fires before the Panel is collapsed.  A handler can return false to cancel the collapse.
                 * @param {Ext.Panel} p the Panel being collapsed.
                 * @param {Boolean} animate True if the collapse is animated, else false.
                 */
                'beforecollapse',
                /**
                 * @event beforeexpand
                 * Fires before the Panel is expanded.  A handler can return false to cancel the expand.
                 * @param {Ext.Panel} p The Panel being expanded.
                 * @param {Boolean} animate True if the expand is animated, else false.
                 */
                'beforeexpand',
                /**
                 * @event beforeclose
                 * Fires before the Panel is closed.  Note that Panels do not directly support being closed, but some
                 * Panel subclasses do (like {@link Ext.Window}) or a Panel within a Ext.TabPanel.  This event only
                 * applies to such subclasses.
                 * A handler can return false to cancel the close.
                 * @param {Ext.Panel} p The Panel being closed.
                 */
                'beforeclose',
                /**
                 * @event close
                 * Fires after the Panel is closed.  Note that Panels do not directly support being closed, but some
                 * Panel subclasses do (like {@link Ext.Window}) or a Panel within a Ext.TabPanel.
                 * @param {Ext.Panel} p The Panel that has been closed.
                 */
                'close',
                /**
                 * @event activate
                 * Fires after the Panel has been visually activated.
                 * Note that Panels do not directly support being activated, but some Panel subclasses
                 * do (like {@link Ext.Window}). Panels which are child Components of a TabPanel fire the
                 * activate and deactivate events under the control of the TabPanel.
                 * @param {Ext.Panel} p The Panel that has been activated.
                 */
                'activate',
                /**
                 * @event deactivate
                 * Fires after the Panel has been visually deactivated.
                 * Note that Panels do not directly support being deactivated, but some Panel subclasses
                 * do (like {@link Ext.Window}). Panels which are child Components of a TabPanel fire the
                 * activate and deactivate events under the control of the TabPanel.
                 * @param {Ext.Panel} p The Panel that has been deactivated.
                 */
                'deactivate'
            );

            if(this.unstyled){
                this.baseCls = 'x-plain';
            }

            this.toolbars = [];
            // shortcuts
            if(this.tbar){
                this.elements += ',tbar';
                this.topToolbar = this.createToolbar(this.tbar);
                this.tbar = null;

            }
            if(this.bbar){
                this.elements += ',bbar';
                this.bottomToolbar = this.createToolbar(this.bbar);
                this.bbar = null;
            }

            if(this.header === true){
                this.elements += ',header';
                this.header = null;
            }else if(this.headerCfg || (this.title && this.header !== false)){
                this.elements += ',header';
            }

            if(this.footerCfg || this.footer === true){
                this.elements += ',footer';
                this.footer = null;
            }

            if(this.buttons){
                this.fbar = this.buttons;
                this.buttons = null;
            }
            if(this.fbar){
                this.createFbar(this.fbar);
            }
            if(this.autoLoad){
                this.on('render', this.doAutoLoad, this, {delay:10});
            }
        },

        // private
        createFbar : function(fbar){
            var min = this.minButtonWidth;
            this.elements += ',footer';
            this.fbar = this.createToolbar(fbar, {
                buttonAlign: this.buttonAlign,
                toolbarCls: 'x-panel-fbar',
                enableOverflow: false,
                defaults: function(c){
                    return {
                        minWidth: c.minWidth || min
                    };
                }
            });
            // @compat addButton and buttons could possibly be removed
            // @target 4.0
            /**
             * This Panel's Array of buttons as created from the {@link #buttons}
             * config property. Read only.
             * @type Array
             * @property buttons
             */
            this.fbar.items.each(function(c){
                c.minWidth = c.minWidth || this.minButtonWidth;
            }, this);
            this.buttons = this.fbar.items.items;
        },

        // private
        createToolbar: function(tb, options){
            var result;
            // Convert array to proper toolbar config
            if(Ext.isArray(tb)){
                tb = {
                    items: tb
                };
            }
            result = tb.events ? Ext.apply(tb, options) : this.createComponent(Ext.apply({}, tb, options), 'toolbar');
            this.toolbars.push(result);
            return result;
        },

        // private
        createElement : function(name, pnode){
            if(this[name]){
                pnode.appendChild(this[name].dom);
                return;
            }

            if(name === 'bwrap' || this.elements.indexOf(name) != -1){
                if(this[name+'Cfg']){
                    this[name] = Ext.fly(pnode).createChild(this[name+'Cfg']);
                }else{
                    var el = document.createElement('div');
                    el.className = this[name+'Cls'];
                    this[name] = Ext.get(pnode.appendChild(el));
                }
                if(this[name+'CssClass']){
                    this[name].addClass(this[name+'CssClass']);
                }
                if(this[name+'Style']){
                    this[name].applyStyles(this[name+'Style']);
                }
            }
        },

        // private
        onRender : function(ct, position){
            Ext.Panel.superclass.onRender.call(this, ct, position);
            this.createClasses();

            var el = this.el,
                d = el.dom,
                bw,
                ts;

            if(this.collapsible && !this.hideCollapseTool){
                this.tools = this.tools ? this.tools.slice(0) : [];
                this.tools[this.collapseFirst?'unshift':'push']({
                    id: 'toggle',
                    handler : this.toggleCollapse,
                    scope: this
                });
            }

            if(this.tools){
                ts = this.tools;
                this.elements += (this.header !== false) ? ',header' : '';
            }
            this.tools = {};

            el.addClass(this.baseCls);
            if(d.firstChild){ // existing markup
                this.header = el.down('.'+this.headerCls);
                this.bwrap = el.down('.'+this.bwrapCls);
                var cp = this.bwrap ? this.bwrap : el;
                this.tbar = cp.down('.'+this.tbarCls);
                this.body = cp.down('.'+this.bodyCls);
                this.bbar = cp.down('.'+this.bbarCls);
                this.footer = cp.down('.'+this.footerCls);
                this.fromMarkup = true;
            }
            if (this.preventBodyReset === true) {
                el.addClass('x-panel-reset');
            }
            if(this.cls){
                el.addClass(this.cls);
            }

            if(this.buttons){
                this.elements += ',footer';
            }

            // This block allows for maximum flexibility and performance when using existing markup

            // framing requires special markup
            if(this.frame){
                el.insertHtml('afterBegin', String.format(Ext.Element.boxMarkup, this.baseCls));

                this.createElement('header', d.firstChild.firstChild.firstChild);
                this.createElement('bwrap', d);

                // append the mid and bottom frame to the bwrap
                bw = this.bwrap.dom;
                var ml = d.childNodes[1], bl = d.childNodes[2];
                bw.appendChild(ml);
                bw.appendChild(bl);

                var mc = bw.firstChild.firstChild.firstChild;
                this.createElement('tbar', mc);
                this.createElement('body', mc);
                this.createElement('bbar', mc);
                this.createElement('footer', bw.lastChild.firstChild.firstChild);

                if(!this.footer){
                    this.bwrap.dom.lastChild.className += ' x-panel-nofooter';
                }
                /*
                 * Store a reference to this element so:
                 * a) We aren't looking it up all the time
                 * b) The last element is reported incorrectly when using a loadmask
                 */
                this.ft = Ext.get(this.bwrap.dom.lastChild);
                this.mc = Ext.get(mc);
            }else{
                this.createElement('header', d);
                this.createElement('bwrap', d);

                // append the mid and bottom frame to the bwrap
                bw = this.bwrap.dom;
                this.createElement('tbar', bw);
                this.createElement('body', bw);
                this.createElement('bbar', bw);
                this.createElement('footer', bw);

                if(!this.header){
                    this.body.addClass(this.bodyCls + '-noheader');
                    if(this.tbar){
                        this.tbar.addClass(this.tbarCls + '-noheader');
                    }
                }
            }

            if(Ext.isDefined(this.padding)){
                this.body.setStyle('padding', this.body.addUnits(this.padding));
            }

            if(this.border === false){
                this.el.addClass(this.baseCls + '-noborder');
                this.body.addClass(this.bodyCls + '-noborder');
                if(this.header){
                    this.header.addClass(this.headerCls + '-noborder');
                }
                if(this.footer){
                    this.footer.addClass(this.footerCls + '-noborder');
                }
                if(this.tbar){
                    this.tbar.addClass(this.tbarCls + '-noborder');
                }
                if(this.bbar){
                    this.bbar.addClass(this.bbarCls + '-noborder');
                }
            }

            if(this.bodyBorder === false){
               this.body.addClass(this.bodyCls + '-noborder');
            }

            this.bwrap.enableDisplayMode('block');

            if(this.header){
                this.header.unselectable();

                // for tools, we need to wrap any existing header markup
                if(this.headerAsText){
                    this.header.dom.innerHTML =
                        ''+this.header.dom.innerHTML+'';

                    if(this.iconCls){
                        this.setIconClass(this.iconCls);
                    }
                }
            }

            if(this.floating){
                this.makeFloating(this.floating);
            }

            if(this.collapsible && this.titleCollapse && this.header){
                this.mon(this.header, 'click', this.toggleCollapse, this);
                this.header.setStyle('cursor', 'pointer');
            }
            if(ts){
                this.addTool.apply(this, ts);
            }

            // Render Toolbars.
            if(this.fbar){
                this.footer.addClass('x-panel-btns');
                this.fbar.ownerCt = this;
                this.fbar.render(this.footer);
                this.footer.createChild({cls:'x-clear'});
            }
            if(this.tbar && this.topToolbar){
                this.topToolbar.ownerCt = this;
                this.topToolbar.render(this.tbar);
            }
            if(this.bbar && this.bottomToolbar){
                this.bottomToolbar.ownerCt = this;
                this.bottomToolbar.render(this.bbar);
            }
        },

        /**
         * Sets the CSS class that provides the icon image for this panel.  This method will replace any existing
         * icon class if one has already been set and fire the {@link #iconchange} event after completion.
         * @param {String} cls The new CSS class name
         */
        setIconClass : function(cls){
            var old = this.iconCls;
            this.iconCls = cls;
            if(this.rendered && this.header){
                if(this.frame){
                    this.header.addClass('x-panel-icon');
                    this.header.replaceClass(old, this.iconCls);
                }else{
                    var hd = this.header,
                        img = hd.child('img.x-panel-inline-icon');
                    if(img){
                        Ext.fly(img).replaceClass(old, this.iconCls);
                    }else{
                        var hdspan = hd.child('span.' + this.headerTextCls);
                        if (hdspan) {
                            Ext.DomHelper.insertBefore(hdspan.dom, {
                                tag:'img', alt: '', src: Ext.BLANK_IMAGE_URL, cls:'x-panel-inline-icon '+this.iconCls
                            });
                        }
                     }
                }
            }
            this.fireEvent('iconchange', this, cls, old);
        },

        // private
        makeFloating : function(cfg){
            this.floating = true;
            this.el = new Ext.Layer(Ext.apply({}, cfg, {
                shadow: Ext.isDefined(this.shadow) ? this.shadow : 'sides',
                shadowOffset: this.shadowOffset,
                constrain:false,
                shim: this.shim === false ? false : undefined
            }), this.el);
        },

        /**
         * Returns the {@link Ext.Toolbar toolbar} from the top ({@link #tbar}) section of the panel.
         * @return {Ext.Toolbar} The toolbar
         */
        getTopToolbar : function(){
            return this.topToolbar;
        },

        /**
         * Returns the {@link Ext.Toolbar toolbar} from the bottom ({@link #bbar}) section of the panel.
         * @return {Ext.Toolbar} The toolbar
         */
        getBottomToolbar : function(){
            return this.bottomToolbar;
        },

        /**
         * Returns the {@link Ext.Toolbar toolbar} from the footer ({@link #fbar}) section of the panel.
         * @return {Ext.Toolbar} The toolbar
         */
        getFooterToolbar : function() {
            return this.fbar;
        },

        /**
         * Adds a button to this panel.  Note that this method must be called prior to rendering.  The preferred
         * approach is to add buttons via the {@link #buttons} config.
         * @param {String/Object} config A valid {@link Ext.Button} config.  A string will become the text for a default
         * button config, an object will be treated as a button config object.
         * @param {Function} handler The function to be called on button {@link Ext.Button#click}
         * @param {Object} scope The scope (this reference) in which the button handler function is executed. Defaults to the Button.
         * @return {Ext.Button} The button that was added
         */
        addButton : function(config, handler, scope){
            if(!this.fbar){
                this.createFbar([]);
            }
            if(handler){
                if(Ext.isString(config)){
                    config = {text: config};
                }
                config = Ext.apply({
                    handler: handler,
                    scope: scope
                }, config);
            }
            return this.fbar.add(config);
        },

        // private
        addTool : function(){
            if(!this.rendered){
                if(!this.tools){
                    this.tools = [];
                }
                Ext.each(arguments, function(arg){
                    this.tools.push(arg);
                }, this);
                return;
            }
             // nowhere to render tools!
            if(!this[this.toolTarget]){
                return;
            }
            if(!this.toolTemplate){
                // initialize the global tool template on first use
                var tt = new Ext.Template(
                     ' '
                );
                tt.disableFormats = true;
                tt.compile();
                Ext.Panel.prototype.toolTemplate = tt;
            }
            for(var i = 0, a = arguments, len = a.length; i < len; i++) {
                var tc = a[i];
                if(!this.tools[tc.id]){
                    var overCls = 'x-tool-'+tc.id+'-over';
                    var t = this.toolTemplate.insertFirst(this[this.toolTarget], tc, true);
                    this.tools[tc.id] = t;
                    t.enableDisplayMode('block');
                    this.mon(t, 'click',  this.createToolHandler(t, tc, overCls, this));
                    if(tc.on){
                        this.mon(t, tc.on);
                    }
                    if(tc.hidden){
                        t.hide();
                    }
                    if(tc.qtip){
                        if(Ext.isObject(tc.qtip)){
                            Ext.QuickTips.register(Ext.apply({
                                  target: t.id
                            }, tc.qtip));
                        } else {
                            t.dom.qtip = tc.qtip;
                        }
                    }
                    t.addClassOnOver(overCls);
                }
            }
        },

        onLayout : function(shallow, force){
            Ext.Panel.superclass.onLayout.apply(this, arguments);
            if(this.hasLayout && this.toolbars.length > 0){
                Ext.each(this.toolbars, function(tb){
                    tb.doLayout(undefined, force);
                });
                this.syncHeight();
            }
        },

        syncHeight : function(){
            var h = this.toolbarHeight,
                    bd = this.body,
                    lsh = this.lastSize.height,
                    sz;

            if(this.autoHeight || !Ext.isDefined(lsh) || lsh == 'auto'){
                return;
            }

            if(h != this.getToolbarHeight()){
                h = Math.max(0, lsh - this.getFrameHeight());
                bd.setHeight(h);
                sz = bd.getSize();
                this.toolbarHeight = this.getToolbarHeight();
                this.onBodyResize(sz.width, sz.height);
            }
        },

        // private
        onShow : function(){
            if(this.floating){
                return this.el.show();
            }
            Ext.Panel.superclass.onShow.call(this);
        },

        // private
        onHide : function(){
            if(this.floating){
                return this.el.hide();
            }
            Ext.Panel.superclass.onHide.call(this);
        },

        // private
        createToolHandler : function(t, tc, overCls, panel){
            return function(e){
                t.removeClass(overCls);
                if(tc.stopEvent !== false){
                    e.stopEvent();
                }
                if(tc.handler){
                    tc.handler.call(tc.scope || t, e, t, panel, tc);
                }
            };
        },

        // private
        afterRender : function(){
            if(this.floating && !this.hidden){
                this.el.show();
            }
            if(this.title){
                this.setTitle(this.title);
            }
            Ext.Panel.superclass.afterRender.call(this); // do sizing calcs last
            if (this.collapsed) {
                this.collapsed = false;
                this.collapse(false);
            }
            this.initEvents();
        },

        // private
        getKeyMap : function(){
            if(!this.keyMap){
                this.keyMap = new Ext.KeyMap(this.el, this.keys);
            }
            return this.keyMap;
        },

        // private
        initEvents : function(){
            if(this.keys){
                this.getKeyMap();
            }
            if(this.draggable){
                this.initDraggable();
            }
            if(this.toolbars.length > 0){
                Ext.each(this.toolbars, function(tb){
                    tb.doLayout();
                    tb.on({
                        scope: this,
                        afterlayout: this.syncHeight,
                        remove: this.syncHeight
                    });
                }, this);
                this.syncHeight();
            }

        },

        // private
        initDraggable : function(){
            /**
             * If this Panel is configured {@link #draggable}, this property will contain
             * an instance of {@link Ext.dd.DragSource} which handles dragging the Panel.
             * The developer must provide implementations of the abstract methods of {@link Ext.dd.DragSource}
             * in order to supply behaviour for each stage of the drag/drop process. See {@link #draggable}.
             * @type Ext.dd.DragSource.
             * @property dd
             */
            this.dd = new Ext.Panel.DD(this, Ext.isBoolean(this.draggable) ? null : this.draggable);
        },

        // private
        beforeEffect : function(anim){
            if(this.floating){
                this.el.beforeAction();
            }
            if(anim !== false){
                this.el.addClass('x-panel-animated');
            }
        },

        // private
        afterEffect : function(anim){
            this.syncShadow();
            this.el.removeClass('x-panel-animated');
        },

        // private - wraps up an animation param with internal callbacks
        createEffect : function(a, cb, scope){
            var o = {
                scope:scope,
                block:true
            };
            if(a === true){
                o.callback = cb;
                return o;
            }else if(!a.callback){
                o.callback = cb;
            }else { // wrap it up
                o.callback = function(){
                    cb.call(scope);
                    Ext.callback(a.callback, a.scope);
                };
            }
            return Ext.applyIf(o, a);
        },

        /**
         * Collapses the panel body so that it becomes hidden.  Fires the {@link #beforecollapse} event which will
         * cancel the collapse action if it returns false.
         * @param {Boolean} animate True to animate the transition, else false (defaults to the value of the
         * {@link #animCollapse} panel config)
         * @return {Ext.Panel} this
         */
        collapse : function(animate){
            if(this.collapsed || this.el.hasFxBlock() || this.fireEvent('beforecollapse', this, animate) === false){
                return;
            }
            var doAnim = animate === true || (animate !== false && this.animCollapse);
            this.beforeEffect(doAnim);
            this.onCollapse(doAnim, animate);
            return this;
        },

        // private
        onCollapse : function(doAnim, animArg){
            if(doAnim){
                this[this.collapseEl].slideOut(this.slideAnchor,
                        Ext.apply(this.createEffect(animArg||true, this.afterCollapse, this),
                            this.collapseDefaults));
            }else{
                this[this.collapseEl].hide(this.hideMode);
                this.afterCollapse(false);
            }
        },

        // private
        afterCollapse : function(anim){
            this.collapsed = true;
            this.el.addClass(this.collapsedCls);
            if(anim !== false){
                this[this.collapseEl].hide(this.hideMode);
            }
            this.afterEffect(anim);

            // Reset lastSize of all sub-components so they KNOW they are in a collapsed container
            this.cascade(function(c) {
                if (c.lastSize) {
                    c.lastSize = { width: undefined, height: undefined };
                }
            });
            this.fireEvent('collapse', this);
        },

        /**
         * Expands the panel body so that it becomes visible.  Fires the {@link #beforeexpand} event which will
         * cancel the expand action if it returns false.
         * @param {Boolean} animate True to animate the transition, else false (defaults to the value of the
         * {@link #animCollapse} panel config)
         * @return {Ext.Panel} this
         */
        expand : function(animate){
            if(!this.collapsed || this.el.hasFxBlock() || this.fireEvent('beforeexpand', this, animate) === false){
                return;
            }
            var doAnim = animate === true || (animate !== false && this.animCollapse);
            this.el.removeClass(this.collapsedCls);
            this.beforeEffect(doAnim);
            this.onExpand(doAnim, animate);
            return this;
        },

        // private
        onExpand : function(doAnim, animArg){
            if(doAnim){
                this[this.collapseEl].slideIn(this.slideAnchor,
                        Ext.apply(this.createEffect(animArg||true, this.afterExpand, this),
                            this.expandDefaults));
            }else{
                this[this.collapseEl].show(this.hideMode);
                this.afterExpand(false);
            }
        },

        // private
        afterExpand : function(anim){
            this.collapsed = false;
            if(anim !== false){
                this[this.collapseEl].show(this.hideMode);
            }
            this.afterEffect(anim);
            if (this.deferLayout) {
                delete this.deferLayout;
                this.doLayout(true);
            }
            this.fireEvent('expand', this);
        },

        /**
         * Shortcut for performing an {@link #expand} or {@link #collapse} based on the current state of the panel.
         * @param {Boolean} animate True to animate the transition, else false (defaults to the value of the
         * {@link #animCollapse} panel config)
         * @return {Ext.Panel} this
         */
        toggleCollapse : function(animate){
            this[this.collapsed ? 'expand' : 'collapse'](animate);
            return this;
        },

        // private
        onDisable : function(){
            if(this.rendered && this.maskDisabled){
                this.el.mask();
            }
            Ext.Panel.superclass.onDisable.call(this);
        },

        // private
        onEnable : function(){
            if(this.rendered && this.maskDisabled){
                this.el.unmask();
            }
            Ext.Panel.superclass.onEnable.call(this);
        },

        // private
        onResize : function(adjWidth, adjHeight, rawWidth, rawHeight){
            var w = adjWidth,
                h = adjHeight;

            if(Ext.isDefined(w) || Ext.isDefined(h)){
                if(!this.collapsed){
                    // First, set the the Panel's body width.
                    // If we have auto-widthed it, get the resulting full offset width so we can size the Toolbars to match
                    // The Toolbars must not buffer this resize operation because we need to know their heights.

                    if(Ext.isNumber(w)){
                        this.body.setWidth(w = this.adjustBodyWidth(w - this.getFrameWidth()));
                    } else if (w == 'auto') {
                        w = this.body.setWidth('auto').dom.offsetWidth;
                    } else {
                        w = this.body.dom.offsetWidth;
                    }

                    if(this.tbar){
                        this.tbar.setWidth(w);
                        if(this.topToolbar){
                            this.topToolbar.setSize(w);
                        }
                    }
                    if(this.bbar){
                        this.bbar.setWidth(w);
                        if(this.bottomToolbar){
                            this.bottomToolbar.setSize(w);
                            // The bbar does not move on resize without this.
                            if (Ext.isIE) {
                                this.bbar.setStyle('position', 'static');
                                this.bbar.setStyle('position', '');
                            }
                        }
                    }
                    if(this.footer){
                        this.footer.setWidth(w);
                        if(this.fbar){
                            this.fbar.setSize(Ext.isIE ? (w - this.footer.getFrameWidth('lr')) : 'auto');
                        }
                    }

                    // At this point, the Toolbars must be layed out for getFrameHeight to find a result.
                    if(Ext.isNumber(h)){
                        h = Math.max(0, h - this.getFrameHeight());
                        //h = Math.max(0, h - (this.getHeight() - this.body.getHeight()));
                        this.body.setHeight(h);
                    }else if(h == 'auto'){
                        this.body.setHeight(h);
                    }

                    if(this.disabled && this.el._mask){
                        this.el._mask.setSize(this.el.dom.clientWidth, this.el.getHeight());
                    }
                }else{
                    // Adds an event to set the correct height afterExpand.  This accounts for the deferHeight flag in panel
                    this.queuedBodySize = {width: w, height: h};
                    if(!this.queuedExpand && this.allowQueuedExpand !== false){
                        this.queuedExpand = true;
                        this.on('expand', function(){
                            delete this.queuedExpand;
                            this.onResize(this.queuedBodySize.width, this.queuedBodySize.height);
                        }, this, {single:true});
                    }
                }
                this.onBodyResize(w, h);
            }
            this.syncShadow();
            Ext.Panel.superclass.onResize.call(this, adjWidth, adjHeight, rawWidth, rawHeight);

        },

        // private
        onBodyResize: function(w, h){
            this.fireEvent('bodyresize', this, w, h);
        },

        // private
        getToolbarHeight: function(){
            var h = 0;
            if(this.rendered){
                Ext.each(this.toolbars, function(tb){
                    h += tb.getHeight();
                }, this);
            }
            return h;
        },

        // deprecate
        adjustBodyHeight : function(h){
            return h;
        },

        // private
        adjustBodyWidth : function(w){
            return w;
        },

        // private
        onPosition : function(){
            this.syncShadow();
        },

        /**
         * Returns the width in pixels of the framing elements of this panel (not including the body width).  To
         * retrieve the body width see {@link #getInnerWidth}.
         * @return {Number} The frame width
         */
        getFrameWidth : function(){
            var w = this.el.getFrameWidth('lr') + this.bwrap.getFrameWidth('lr');

            if(this.frame){
                var l = this.bwrap.dom.firstChild;
                w += (Ext.fly(l).getFrameWidth('l') + Ext.fly(l.firstChild).getFrameWidth('r'));
                w += this.mc.getFrameWidth('lr');
            }
            return w;
        },

        /**
         * Returns the height in pixels of the framing elements of this panel (including any top and bottom bars and
         * header and footer elements, but not including the body height).  To retrieve the body height see {@link #getInnerHeight}.
         * @return {Number} The frame height
         */
        getFrameHeight : function() {
            var h  = this.el.getFrameWidth('tb') + this.bwrap.getFrameWidth('tb');
            h += (this.tbar ? this.tbar.getHeight() : 0) +
                 (this.bbar ? this.bbar.getHeight() : 0);

            if(this.frame){
                h += this.el.dom.firstChild.offsetHeight + this.ft.dom.offsetHeight + this.mc.getFrameWidth('tb');
            }else{
                h += (this.header ? this.header.getHeight() : 0) +
                    (this.footer ? this.footer.getHeight() : 0);
            }
            return h;
        },

        /**
         * Returns the width in pixels of the body element (not including the width of any framing elements).
         * For the frame width see {@link #getFrameWidth}.
         * @return {Number} The body width
         */
        getInnerWidth : function(){
            return this.getSize().width - this.getFrameWidth();
        },

        /**
         * Returns the height in pixels of the body element (not including the height of any framing elements).
         * For the frame height see {@link #getFrameHeight}.
         * @return {Number} The body height
         */
        getInnerHeight : function(){
            return this.body.getHeight();
            /* Deprecate
                return this.getSize().height - this.getFrameHeight();
            */
        },

        // private
        syncShadow : function(){
            if(this.floating){
                this.el.sync(true);
            }
        },

        // private
        getLayoutTarget : function(){
            return this.body;
        },

        // private
        getContentTarget : function(){
            return this.body;
        },

        /**
         * Sets the title text for the panel and optionally the {@link #iconCls icon class}.
         * In order to be able to set the title, a header element must have been created
         * for the Panel. This is triggered either by configuring the Panel with a non-blank {@link #title},
         * or configuring it with {@link #header}: true.
         * @param {String} title The title text to set
         * @param {String} iconCls (optional) {@link #iconCls iconCls} A user-defined CSS class that provides the icon image for this panel
         */
        setTitle : function(title, iconCls){
            this.title = title;
            if(this.header && this.headerAsText){
                this.header.child('span').update(title);
            }
            if(iconCls){
                this.setIconClass(iconCls);
            }
            this.fireEvent('titlechange', this, title);
            return this;
        },

        /**
         * Get the {@link Ext.Updater} for this panel. Enables you to perform Ajax updates of this panel's body.
         * @return {Ext.Updater} The Updater
         */
        getUpdater : function(){
            return this.body.getUpdater();
        },

         /**
         * Loads this content panel immediately with content returned from an XHR call.
         * @param {Object/String/Function} config A config object containing any of the following options:

    panel.load({
        url: 'your-url.php',
        params: {param1: 'foo', param2: 'bar'}, // or a URL encoded string
        callback: yourFunction,
        scope: yourObject, // optional scope for the callback
        discardUrl: false,
        nocache: false,
        text: 'Loading...',
        timeout: 30,
        scripts: false
    });

         * The only required property is url. The optional properties nocache, text and scripts
         * are shorthand for disableCaching, indicatorText and loadScripts and are used to set their
         * associated property on this panel Updater instance.
         * @return {Ext.Panel} this
         */
        load : function(){
            var um = this.body.getUpdater();
            um.update.apply(um, arguments);
            return this;
        },

        // private
        beforeDestroy : function(){
            Ext.Panel.superclass.beforeDestroy.call(this);
            if(this.header){
                this.header.removeAllListeners();
            }
            if(this.tools){
                for(var k in this.tools){
                    Ext.destroy(this.tools[k]);
                }
            }
            if(this.toolbars.length > 0){
                Ext.each(this.toolbars, function(tb){
                    tb.un('afterlayout', this.syncHeight, this);
                    tb.un('remove', this.syncHeight, this);
                }, this);
            }
            if(Ext.isArray(this.buttons)){
                while(this.buttons.length) {
                    Ext.destroy(this.buttons[0]);
                }
            }
            if(this.rendered){
                Ext.destroy(
                    this.ft,
                    this.header,
                    this.footer,
                    this.tbar,
                    this.bbar,
                    this.body,
                    this.mc,
                    this.bwrap,
                    this.dd
                );
                if (this.fbar) {
                    Ext.destroy(
                        this.fbar,
                        this.fbar.el
                    );
                }
            }
            Ext.destroy(this.toolbars);
        },

        // private
        createClasses : function(){
            this.headerCls = this.baseCls + '-header';
            this.headerTextCls = this.baseCls + '-header-text';
            this.bwrapCls = this.baseCls + '-bwrap';
            this.tbarCls = this.baseCls + '-tbar';
            this.bodyCls = this.baseCls + '-body';
            this.bbarCls = this.baseCls + '-bbar';
            this.footerCls = this.baseCls + '-footer';
        },

        // private
        createGhost : function(cls, useShim, appendTo){
            var el = document.createElement('div');
            el.className = 'x-panel-ghost ' + (cls ? cls : '');
            if(this.header){
                el.appendChild(this.el.dom.firstChild.cloneNode(true));
            }
            Ext.fly(el.appendChild(document.createElement('ul'))).setHeight(this.bwrap.getHeight());
            el.style.width = this.el.dom.offsetWidth + 'px';;
            if(!appendTo){
                this.container.dom.appendChild(el);
            }else{
                Ext.getDom(appendTo).appendChild(el);
            }
            if(useShim !== false && this.el.useShim !== false){
                var layer = new Ext.Layer({shadow:false, useDisplay:true, constrain:false}, el);
                layer.show();
                return layer;
            }else{
                return new Ext.Element(el);
            }
        },

        // private
        doAutoLoad : function(){
            var u = this.body.getUpdater();
            if(this.renderer){
                u.setRenderer(this.renderer);
            }
            u.update(Ext.isObject(this.autoLoad) ? this.autoLoad : {url: this.autoLoad});
        },

        /**
         * Retrieve a tool by id.
         * @param {String} id
         * @return {Object} tool
         */
        getTool : function(id) {
            return this.tools[id];
        }

    /**
     * @cfg {String} autoEl @hide
     */
    });
    Ext.reg('panel', Ext.Panel);