Bug with advancedDataGrid !!! ("groupIconFunction" not working properly)

Question

Suprisingly, the following code doesn't set an icon for the tree's second level of items.
XML data is simplified here but it's only to make this simpler to read. (Just replace the path to your image file and run the thing. Have fun !)
<?xml version="1.0"?>
<!-- dpcontrols/adg/SimpleHierarchicalADGGroupIcon.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    <![CDATA[
          import mx.collections.ArrayCollection;
        //  include "SimpleHierarchicalData.as";
         // Embed the icon for the groups.
                [Bindable]
                [Embed(source="assets/images/16/_hd.png")]
                public var hd:Class;
                [Bindable]
                [Embed(source="assets/images/16/_r.png")]
                public var r:Class;
         // Define the groupIconFunction callback function.
         public function myIconFunc(item:Object, depth:int):Class {
             if(depth == 1)
                 // If this is the top-level of the tree, return the icon.
                 return hd;
             if(depth == 2)
                 // If this is the top-level of the tree, return the icon.
                 return r;
             else
                 // If this is any other level, return null.
                 return null;
      ]]>
    </mx:Script>
<mx:XMLList id="dpHierarchyXML" >
  <Region Region="Southwest">
   <Region Region="Arizona" Territory_Rep="Barbara Jennings" Actual="38865" Estimate="40000">
   </Region>
  </Region>
</mx:XMLList>
    <mx:AdvancedDataGrid
        width="100%" height="100%"
        groupIconFunction="myIconFunc"
         displayItemsExpanded="true" >
        <mx:dataProvider>
            <mx:HierarchicalData source="{dpHierarchyXML}"/>
        </mx:dataProvider>
        <mx:columns>
            <mx:AdvancedDataGridColumn dataField="@Region" itemRenderer="itemRender"/>
            <mx:AdvancedDataGridColumn dataField="@Territory_Rep"
                headerText="Territory Rep"/>
            <mx:AdvancedDataGridColumn dataField="@Actual"/>
            <mx:AdvancedDataGridColumn dataField="@Estimate"/>
        </mx:columns>
    </mx:AdvancedDataGrid>   
</mx:Application>

Answer 1

Hi Green4ever,
At a very first sight I'd suspect UndoModes.FAST_ENTIRE_SCRIPT which, as you may know, can deeply scramble script steps, especially when a try...catch is in use.
Try to replace FAST_ENTIRE_SCRIPT by ENTIRE_SCRIPT and tell us.
@+
Marc