Add item to StdListBoxWidgetN

using the CC2014.

I would like to add an item to the StdListBoxWidgetN.

Put the code but the item does not appear.

Below ismy source :

.fr   widget

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StdListBoxWidgetN
    (
      kMyListBoxWidgetID,   // WidgetId

                     kSysOwnerDrawListBoxPMRsrcId,// RsrcId

                     kBindAll,               // Frame binding

                     Frame(-1, 21, 389, 96)       // Frame

                     kTrue, kTrue,         // Visible, Enabled

                     kTrue,                   // fEraseBeforeDraw

                     kInterfacePaletteFill,// InterfaceColor to erase to

                     1,0,                       // List dimensions

                     19,                       // Cell height

                     1,                         // Border width

                     kFalse,kTrue,         // Has scroll bar (h,v)

                     kFalse,                  // Multiselection

                     kFalse,                  // List items can be reordered

                     kFalse,                  // Draggable to new/delete buttons

                     kFalse,                  // Drag/Dropable to other windows

                     kFalse,                  // An item always has to be selected

                     kFalse,                  // Don't notify on reselect

                     kMyListElementResourceID     // Fill list box with widgets with this ID (default is 0)

                     kHideRootNode | kDrawEndLine,       // Display Root Node

                     kFalse,                  //Use H Scroll bar

                     kTrue,                   //Use V scroll bar

                     20,                       // Vertical Scroll Button Increment

                     20,                       // Vertical Thumb Scroll Increment

                     0,                         // Horizontal Scroll Button Increment - Not Used

                     0,                         // Horizontal Thumb Scroll Increment - Not Used

                     1,                         // Items selectable, 0 = No Selection, 1 = Single Selection, 2 = Multiple Selection

                     kFalse,                  // Allow children from multiple parents to be selected

                     kFalse,                  // Allow discontiguous selection
    ),

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dlgObserver

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void BscDlgDialogObserver::Update
(
    const ClassID& theChange,
    ISubject* theSubject,
    const PMIID &protocol,
    void* changedBy
)
{
    CDialogObserver::Update(theChange, theSubject, protocol, changedBy);

    do
    {

         InterfacePtr<IPanelControlData> PanelControlData(this, UseDefaultIID());
         if (PanelControlData == nil)  {    
               break;
         }

         IControlView *List = PanelControlData -> FindWidget(kDCRListBoxWidgetID);
         if(!List)
             break;

    //   InterfacePtr<IStringListBoxControlData> ListData(List, UseDefaultIID());
    //   if(!ListData)
    //       break;

         InterfacePtr< IListControlDataOf<PMString> > ListData (List, UseDefaultIID());

         if (ListData == nil)

              break;

         PMString test1("TEST1");
         PMString test2("TEST2");
         PMString test3("TEST3");

         ListData->Add(test1);
         ListData->Add(test2);
         ListData->Add(test3);

//        InterfacePtr<IListBoxController> ListControl(ListData, UseDefaultIID());
//        if(!ListControl)
//             break;
//         int32 SelectedRow = ListControl -> GetSelected();
//         PMString MyString =  (*ListData)[SelectedRow];

//         MyString = PMString("Some New Data");

//         ListData -> Replace(MyString, SelectedRow);

          ListData -> Refresh();
    } while (false);
}

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