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I am trying to use the new DragAndDrop manager with the RadComboBox, I want to be able to drop an element from a treeview onto the ComboBox and apply a custom Drop Event that will select the dragged entity from the list. I have AllowDrop="True" on the ComboBox and I know the Treeview is set up correctly because I use it to drag to a ListBox. When the line DragDropManager.AddDropHandler(RadComboBoxBelongsTo, OnDrop); is run I get the error: Cannot find a Resource with the Name/Key DraggableItem. How do I drag to a RadComboBox??