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AutoDragExpand not working

Hi all,
I am currently experiencing a problem with the WinTree component.

I implemented Drag/Drop as described in the related Sample (WinTree DragDrop) and used the UltraTree_DropHightLight_DrawFilter_Class.cs which I modified a little to suit our needs.

So far everything works fine and pleasant.

Now when dealing with DragDrop functionality it is required to expand a node when the Drag hovers over it. So I implemented the following lines in the load event:

tree.AutoDragExpandDelay = 500;
tree.Override.AllowAutoDragExpand = AllowAutoDragExpand.ExpandOnDragHover;

I have chosen the ExpandOnHover option because the nodes of a node are only populated when the node is expanded the first time.

I expected that the node is expanded after 500 ms firing the BeforeExpand event so that I can evaluate the childnodes and add them.
Unfortunately this does not seem to happen. The node I hover above always stays closed.

What am I doing wrong here... any help is kindly appreciated.

best regards