Unfortunately, this feature is not supported. One of the main reasons are due to the fact that when dragging from external program in ours the events such GiveFeedback and QueryContinueDrag are not raised from OleDragDrop. Thus, in this scenario there is not reliable way to position drag cue according to the current mouse position.
However, I can suggest the following solution:
- Set RadDragAndDropManager.AllowDrop to true of the root visual of the window.
- Attach to DropQueryEvent of the root visual of the window and use AdornerLayer to draw the drag cue in it (using e.Options.CurrentDragPoint for current mouse position).
Note that this solution will be able to display drag cue only within the boundaries of the window.
If you have any further questions do not hesitate to contact us.
the Telerik team
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