Hi Jzucker,
My sincere apologies for the inconvenience caused.
On consulting with the developer, it is confirmed that the DragOver event behavior is correct and its not a bug .Please take a look at the description given below.
ItemDrag:
Occurs when the user begin dragging an item.
DragOver:
Occurs when the mouse drags an item and it is moving over the client area of thie control.
So, the priority is been given to the ItemDrag Event''s DragDropEffect.And treeViewAdv has the same behavior as the Standard .Net treeView.
Please take a look at the attached sample,which illustrates the above.
Thanks for your patience and interest in Syncfusion products.
Regards,
Deepa.
DragDropIconSample.zip