      /**
       * The constants used in this Content Widget.
       */
      public static interface CwConstants extends Constants,
          ContentWidget.CwConstants {
        String cwCheckBoxCheckAll();

        String[] cwCheckBoxDays();

        String cwCheckBoxDescription();

        String cwCheckBoxName();
      }

      /**
       * An instance of the constants.
       */
      private CwConstants constants;

      /**
       * Initialize this example.
       */
      @Override
      public Widget onInitialize() {
        // Create a vertical panel to align the check boxes
        VerticalPanel vPanel = new VerticalPanel();
        HTML label = new HTML(constants.cwCheckBoxCheckAll());
        label.ensureDebugId("cwCheckBox-label");
        vPanel.add(label);

        // Add a checkbox for each day of the week
        String[] daysOfWeek = constants.cwCheckBoxDays();
        for (int i = 0; i < daysOfWeek.length; i++) {
          String day = daysOfWeek[i];
          CheckBox checkBox = new CheckBox(day);
          checkBox.ensureDebugId("cwCheckBox-" + day);

          // Disable the weekends
          if (i >= 5) {
            checkBox.setEnabled(false);
          }

          vPanel.add(checkBox);
        }

        // Return the panel of checkboxes
        return vPanel;
      }