You need to handle the DragDrop
events yourself in order to be able to drag between the two controls.
Here is a list of all the events you can use: http://www.telerik.com/help/wpf/dragdropmanager-events.html
And you can find various DragDropExamples here:
You can see the setting of the DragVisual in the DragInitialize event.
Let me know if I can help you further with this.
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