This help article
shows how to populate RadTreeView
from code behind. You can also check out the other ways of doing this here
. Keep in mind that populating in code beihind is not the prefered way in Silverlight. Let us know if you need further assistance.
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!