Не работает drag'n'drop из dataGrid-a в Tree

[Azy]

Попытался соорудить из стандартных примеров драг из DataGrid-a в Tree.
Делаю DragManager.acceptDragDrop(dropTarget), но все равно возле курсора появляется значок, что дроп запрещен.

<?xml version="1.0"?>
<!-- dragdrop\simpleDGToDGAlert.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
    width="700" height="250" 
    borderStyle="solid" 
    creationComplete="initApp();">

    <mx:Script>
        <![CDATA[
        	import mx.managers.DragManager;        
            import mx.events.DragEvent; 
            import mx.controls.Alert;
            
            private function initApp():void {
              destgrid.dataProvider =  [
                {Artist:'Carole King', Album:'Tapestry', Price:11.99},
                {Artist:'Paul Simon', Album:'Graceland', Price:10.99},
                {Artist:'Original Cast', Album:'Camelot', Price:12.99},
                {Artist:'The Beatles', Album:'The White Album', Price:11.99}
              ];
              firstList.dataProvider = treeDP;
            }

			private function doDragEnter(event:DragEvent):void
			{
    	        var dropTarget:Tree=Tree(event.currentTarget);

   	            DragManager.acceptDragDrop(dropTarget);
			}
        ]]>
    </mx:Script>
    <mx:XML id="treeDP">
        <node label="Mail">
            <node label="Inbox"/>
            <node label="Personal Folder">
                <node label="Demo"/>
                <node label="Personal"/>
                <node label="Saved Mail"/>
                <node label="bar"/>
            </node>
            <node label="Calendar"/>
            <node label="Sent"/>
            <node label="Trash"/>
        </node>
    </mx:XML>

    <mx:HBox>
    <mx:Tree id="firstList" 
        height="200" width="200"
        showRoot="false"
        labelField="@label"
        dragEnabled="true" 
        dropEnabled="true" 
        dragMoveEnabled="true"
        dragEnter="doDragEnter(event)"
        allowMultipleSelection="true"
        creationComplete="initApp();"/>
    
        <mx:VBox>
            <mx:Label text="Buy These Albums"/>
            <mx:DataGrid id="destgrid" 
                allowMultipleSelection="true" 
                dragEnabled="true" 
                dropEnabled="true" 
                dragMoveEnabled="true">
                <mx:columns>
                    <mx:DataGridColumn dataField="Artist"  />
                    <mx:DataGridColumn dataField="Album" />
                    <mx:DataGridColumn dataField="Price" />
                </mx:columns>    
            </mx:DataGrid>
        </mx:VBox>
    </mx:HBox>
</mx:Application>