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.grid.PropertyRecord
     * A specific {@link Ext.data.Record} type that represents a name/value pair and is made to work with the
     * {@link Ext.grid.PropertyGrid}.  Typically, PropertyRecords do not need to be created directly as they can be
     * created implicitly by simply using the appropriate data configs either via the {@link Ext.grid.PropertyGrid#source}
     * config property or by calling {@link Ext.grid.PropertyGrid#setSource}.  However, if the need arises, these records
     * can also be created explicitly as shwon below.  Example usage:
     *
    var rec = new Ext.grid.PropertyRecord({
        name: 'Birthday',
        value: new Date(Date.parse('05/26/1972'))
    });
    // Add record to an already populated grid
    grid.store.addSorted(rec);

     * @constructor
     * @param {Object} config A data object in the format: {name: [name], value: [value]}.  The specified value's type
     * will be read automatically by the grid to determine the type of editor to use when displaying it.
     */
    Ext.grid.PropertyRecord = Ext.data.Record.create([
        {name:'name',type:'string'}, 'value'
    ]);

    /**
     * @class Ext.grid.PropertyStore
     * @extends Ext.util.Observable
     * A custom wrapper for the {@link Ext.grid.PropertyGrid}'s {@link Ext.data.Store}. This class handles the mapping
     * between the custom data source objects supported by the grid and the {@link Ext.grid.PropertyRecord} format
     * required for compatibility with the underlying store. Generally this class should not need to be used directly --
     * the grid's data should be accessed from the underlying store via the {@link #store} property.
     * @constructor
     * @param {Ext.grid.Grid} grid The grid this store will be bound to
     * @param {Object} source The source data config object
     */
    Ext.grid.PropertyStore = Ext.extend(Ext.util.Observable, {

        constructor : function(grid, source){
            this.grid = grid;
            this.store = new Ext.data.Store({
                recordType : Ext.grid.PropertyRecord
            });
            this.store.on('update', this.onUpdate,  this);
            if(source){
                this.setSource(source);
            }
            Ext.grid.PropertyStore.superclass.constructor.call(this);
        },

        // protected - should only be called by the grid.  Use grid.setSource instead.
        setSource : function(o){
            this.source = o;
            this.store.removeAll();
            var data = [];
            for(var k in o){
                if(this.isEditableValue(o[k])){
                    data.push(new Ext.grid.PropertyRecord({name: k, value: o[k]}, k));
                }
            }
            this.store.loadRecords({records: data}, {}, true);
        },

        // private
        onUpdate : function(ds, record, type){
            if(type == Ext.data.Record.EDIT){
                var v = record.data.value;
                var oldValue = record.modified.value;
                if(this.grid.fireEvent('beforepropertychange', this.source, record.id, v, oldValue) !== false){
                    this.source[record.id] = v;
                    record.commit();
                    this.grid.fireEvent('propertychange', this.source, record.id, v, oldValue);
                }else{
                    record.reject();
                }
            }
        },

        // private
        getProperty : function(row){
           return this.store.getAt(row);
        },

        // private
        isEditableValue: function(val){
            return Ext.isPrimitive(val) || Ext.isDate(val);
        },

        // private
        setValue : function(prop, value, create){
            var r = this.getRec(prop);
            if(r){
                r.set('value', value);
                this.source[prop] = value;
            }else if(create){
                // only create if specified.
                this.source[prop] = value;
                r = new Ext.grid.PropertyRecord({name: prop, value: value}, prop);
                this.store.add(r);

            }
        },

        // private
        remove : function(prop){
            var r = this.getRec(prop);
            if(r){
                this.store.remove(r);
                delete this.source[prop];
            }
        },

        // private
        getRec : function(prop){
            return this.store.getById(prop);
        },

        // protected - should only be called by the grid.  Use grid.getSource instead.
        getSource : function(){
            return this.source;
        }
    });

    /**
     * @class Ext.grid.PropertyColumnModel
     * @extends Ext.grid.ColumnModel
     * A custom column model for the {@link Ext.grid.PropertyGrid}.  Generally it should not need to be used directly.
     * @constructor
     * @param {Ext.grid.Grid} grid The grid this store will be bound to
     * @param {Object} source The source data config object
     */
    Ext.grid.PropertyColumnModel = Ext.extend(Ext.grid.ColumnModel, {
        // private - strings used for locale support
        nameText : 'Name',
        valueText : 'Value',
        dateFormat : 'm/j/Y',
        trueText: 'true',
        falseText: 'false',

        constructor : function(grid, store){
            var g = Ext.grid,
    	        f = Ext.form;

    	    this.grid = grid;
    	    g.PropertyColumnModel.superclass.constructor.call(this, [
    	        {header: this.nameText, width:50, sortable: true, dataIndex:'name', id: 'name', menuDisabled:true},
    	        {header: this.valueText, width:50, resizable:false, dataIndex: 'value', id: 'value', menuDisabled:true}
    	    ]);
    	    this.store = store;

    	    var bfield = new f.Field({
    	        autoCreate: {tag: 'select', children: [
    	            {tag: 'option', value: 'true', html: this.trueText},
    	            {tag: 'option', value: 'false', html: this.falseText}
    	        ]},
    	        getValue : function(){
    	            return this.el.dom.value == 'true';
    	        }
    	    });
    	    this.editors = {
    	        'date' : new g.GridEditor(new f.DateField({selectOnFocus:true})),
    	        'string' : new g.GridEditor(new f.TextField({selectOnFocus:true})),
    	        'number' : new g.GridEditor(new f.NumberField({selectOnFocus:true, style:'text-align:left;'})),
    	        'boolean' : new g.GridEditor(bfield, {
    	            autoSize: 'both'
    	        })
    	    };
    	    this.renderCellDelegate = this.renderCell.createDelegate(this);
    	    this.renderPropDelegate = this.renderProp.createDelegate(this);
        },

        // private
        renderDate : function(dateVal){
            return dateVal.dateFormat(this.dateFormat);
        },

        // private
        renderBool : function(bVal){
            return this[bVal ? 'trueText' : 'falseText'];
        },

        // private
        isCellEditable : function(colIndex, rowIndex){
            return colIndex == 1;
        },

        // private
        getRenderer : function(col){
            return col == 1 ?
                this.renderCellDelegate : this.renderPropDelegate;
        },

        // private
        renderProp : function(v){
            return this.getPropertyName(v);
        },

        // private
        renderCell : function(val, meta, rec){
            var renderer = this.grid.customRenderers[rec.get('name')];
            if(renderer){
                return renderer.apply(this, arguments);
            }
            var rv = val;
            if(Ext.isDate(val)){
                rv = this.renderDate(val);
            }else if(typeof val == 'boolean'){
                rv = this.renderBool(val);
            }
            return Ext.util.Format.htmlEncode(rv);
        },

        // private
        getPropertyName : function(name){
            var pn = this.grid.propertyNames;
            return pn && pn[name] ? pn[name] : name;
        },

        // private
        getCellEditor : function(colIndex, rowIndex){
            var p = this.store.getProperty(rowIndex),
                n = p.data.name,
                val = p.data.value;
            if(this.grid.customEditors[n]){
                return this.grid.customEditors[n];
            }
            if(Ext.isDate(val)){
                return this.editors.date;
            }else if(typeof val == 'number'){
                return this.editors.number;
            }else if(typeof val == 'boolean'){
                return this.editors['boolean'];
            }else{
                return this.editors.string;
            }
        },

        // inherit docs
        destroy : function(){
            Ext.grid.PropertyColumnModel.superclass.destroy.call(this);
            this.destroyEditors(this.editors);
            this.destroyEditors(this.grid.customEditors);
        },

        destroyEditors: function(editors){
            for(var ed in editors){
                Ext.destroy(editors[ed]);
            }
        }
    });

    /**
     * @class Ext.grid.PropertyGrid
     * @extends Ext.grid.EditorGridPanel
     * A specialized grid implementation intended to mimic the traditional property grid as typically seen in
     * development IDEs.  Each row in the grid represents a property of some object, and the data is stored
     * as a set of name/value pairs in {@link Ext.grid.PropertyRecord}s.  Example usage:
     *
    var grid = new Ext.grid.PropertyGrid({
        title: 'Properties Grid',
        autoHeight: true,
        width: 300,
        renderTo: 'grid-ct',
        source: {
            "(name)": "My Object",
            "Created": new Date(Date.parse('10/15/2006')),
            "Available": false,
            "Version": .01,
            "Description": "A test object"
        }
    });

     * @constructor
     * @param {Object} config The grid config object
     */
    Ext.grid.PropertyGrid = Ext.extend(Ext.grid.EditorGridPanel, {
        /**
        * @cfg {Object} propertyNames An object containing property name/display name pairs.
        * If specified, the display name will be shown in the name column instead of the property name.
        */
        /**
        * @cfg {Object} source A data object to use as the data source of the grid (see {@link #setSource} for details).
        */
        /**
        * @cfg {Object} customEditors An object containing name/value pairs of custom editor type definitions that allow
        * the grid to support additional types of editable fields.  By default, the grid supports strongly-typed editing
        * of strings, dates, numbers and booleans using built-in form editors, but any custom type can be supported and
        * associated with a custom input control by specifying a custom editor.  The name of the editor
        * type should correspond with the name of the property that will use the editor.  Example usage:
        *
    var grid = new Ext.grid.PropertyGrid({
        ...
        customEditors: {
            'Start Time': new Ext.grid.GridEditor(new Ext.form.TimeField({selectOnFocus:true}))
        },
        source: {
            'Start Time': '10:00 AM'
        }
    });

        */
        /**
        * @cfg {Object} source A data object to use as the data source of the grid (see {@link #setSource} for details).
        */
        /**
        * @cfg {Object} customRenderers An object containing name/value pairs of custom renderer type definitions that allow
        * the grid to support custom rendering of fields.  By default, the grid supports strongly-typed rendering
        * of strings, dates, numbers and booleans using built-in form editors, but any custom type can be supported and
        * associated with the type of the value.  The name of the renderer type should correspond with the name of the property
        * that it will render.  Example usage:
        *
    var grid = new Ext.grid.PropertyGrid({
        ...
        customRenderers: {
            Available: function(v){
                if(v){
                    return 'Yes';
                }else{
                    return 'No';
                }
            }
        },
        source: {
            Available: true
        }
    });

        */

        // private config overrides
        enableColumnMove:false,
        stripeRows:false,
        trackMouseOver: false,
        clicksToEdit:1,
        enableHdMenu : false,
        viewConfig : {
            forceFit:true
        },

        // private
        initComponent : function(){
            this.customRenderers = this.customRenderers || {};
            this.customEditors = this.customEditors || {};
            this.lastEditRow = null;
            var store = new Ext.grid.PropertyStore(this);
            this.propStore = store;
            var cm = new Ext.grid.PropertyColumnModel(this, store);
            store.store.sort('name', 'ASC');
            this.addEvents(
                /**
                 * @event beforepropertychange
                 * Fires before a property value changes.  Handlers can return false to cancel the property change
                 * (this will internally call {@link Ext.data.Record#reject} on the property's record).
                 * @param {Object} source The source data object for the grid (corresponds to the same object passed in
                 * as the {@link #source} config property).
                 * @param {String} recordId The record's id in the data store
                 * @param {Mixed} value The current edited property value
                 * @param {Mixed} oldValue The original property value prior to editing
                 */
                'beforepropertychange',
                /**
                 * @event propertychange
                 * Fires after a property value has changed.
                 * @param {Object} source The source data object for the grid (corresponds to the same object passed in
                 * as the {@link #source} config property).
                 * @param {String} recordId The record's id in the data store
                 * @param {Mixed} value The current edited property value
                 * @param {Mixed} oldValue The original property value prior to editing
                 */
                'propertychange'
            );
            this.cm = cm;
            this.ds = store.store;
            Ext.grid.PropertyGrid.superclass.initComponent.call(this);

    		this.mon(this.selModel, 'beforecellselect', function(sm, rowIndex, colIndex){
                if(colIndex === 0){
                    this.startEditing.defer(200, this, [rowIndex, 1]);
                    return false;
                }
            }, this);
        },

        // private
        onRender : function(){
            Ext.grid.PropertyGrid.superclass.onRender.apply(this, arguments);

            this.getGridEl().addClass('x-props-grid');
        },

        // private
        afterRender: function(){
            Ext.grid.PropertyGrid.superclass.afterRender.apply(this, arguments);
            if(this.source){
                this.setSource(this.source);
            }
        },

        /**
         * Sets the source data object containing the property data.  The data object can contain one or more name/value
         * pairs representing all of the properties of an object to display in the grid, and this data will automatically
         * be loaded into the grid's {@link #store}.  The values should be supplied in the proper data type if needed,
         * otherwise string type will be assumed.  If the grid already contains data, this method will replace any
         * existing data.  See also the {@link #source} config value.  Example usage:
         *
    grid.setSource({
        "(name)": "My Object",
        "Created": new Date(Date.parse('10/15/2006')),  // date type
        "Available": false,  // boolean type
        "Version": .01,      // decimal type
        "Description": "A test object"
    });

         * @param {Object} source The data object
         */
        setSource : function(source){
            this.propStore.setSource(source);
        },

        /**
         * Gets the source data object containing the property data.  See {@link #setSource} for details regarding the
         * format of the data object.
         * @return {Object} The data object
         */
        getSource : function(){
            return this.propStore.getSource();
        },

        /**
         * Sets the value of a property.
         * @param {String} prop The name of the property to set
         * @param {Mixed} value The value to test
         * @param {Boolean} create (Optional) True to create the property if it doesn't already exist. Defaults to false.
         */
        setProperty : function(prop, value, create){
            this.propStore.setValue(prop, value, create);
        },

        /**
         * Removes a property from the grid.
         * @param {String} prop The name of the property to remove
         */
        removeProperty : function(prop){
            this.propStore.remove(prop);
        }

        /**
         * @cfg store
         * @hide
         */
        /**
         * @cfg colModel
         * @hide
         */
        /**
         * @cfg cm
         * @hide
         */
        /**
         * @cfg columns
         * @hide
         */
    });
    Ext.reg("propertygrid", Ext.grid.PropertyGrid);