Add new control to the suite: Shuttle control.
Shuttle controls is a couple of ListBox controls and several buttons in between, that move items from one ListBox to another and vice versa.
Here is an example of the interface:
http://www.mathworks.com/access/helpdesk/help/toolbox/comm/ug/shuttle1.png
Check the following two examples showing how Shuttle control can be easily created using RadListBox or RadTreeView control:
https://github.com/telerik/xaml-sdk/tree/master/ListBox/ShuttleControl
https://github.com/telerik/xaml-sdk/tree/master/TreeView/ShuttleControl