The RadTreeViewItems are containers, actually a visual objects , representations of your data(the business objects). When moving a RadTreeViewItem from a source tree to a destination tree, the destination Item`s children collection type ( the collection in which you want to drop the dragged item) should be the same as the dragged item`s type. This requirement is mandatory.
The DragAndDrop operation between two bound RadTreeViews in two different RadPanes should work "out of the box". If you need to perform custom DragAndDrop behavior , you can try the RadDragAndDropManager
and its events.
Please let us know if you need further assistance on this.
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