:Drag Drop From Panel to Tree

Question

I have two panels in a page.  I am creating a Tree control dynamically and adding to a Panel1.  I have to drag an image from panel2 to the Tree on Panel1.
I set the Tree property to accept the drop. When I drop the image on the Tree,  the DragDropComplete Event is not executing but the DragDropComplete Event of the Panel (Which is Tree parent container)  is executing. 
The DragEnter event on Tree is executing but the DragDropComplete not executing. 
How can I invoke the DragDropComplete event on Tree. Pl show some pointers. I appreciate your help.

Answer 1

instead of dragComplete
     use dragDrop event
and at the end wirte event.stopImmediatePropagation
<Tree dragEnter="treeDragEnter(event)"   dragDrop="treeDragdrop(event)" />
protected function treeDragEnter(event:DragEvent):void
     if(event.dragSource.hasFormat('items'))
          DragManager.acceptDragDrop(DataGrid(event.currentTarget));
protected function treeDragdrop(event:DragEvent):void
     var items:Array = event.dragSource.dataForFormat("items") as Array;
     var str:String = new String(items[0]);var cols:Array = DG.columns;
     if(cols.indexOf(str)<0) {
     event.stopImmediatePropagation();