Hi Robert ,
The RadDragAndDropManager is a static class and not a control. It this sense it unfortunately cannot be added to the ToolBox.
DragDrop can be added to almost any visual object and has no control that you need to inherit or interface to implement, you only need to set attached properties (attachable to any control) and handle the DragDrop routed events on one of its parents (also the application root).
The attached properties you can set are: AllowDrag
and the events that can be handled, DropInfo, DropQuery, DragInfo, DragQuery.
Please come back to us if you need help with integrating the drag/drop.
the Telerik team