Hi Yong-Gu Kang,
The current version of RadTreeListView can handle only one child collection property.
RadGridView can handle more than one( as in your case) . In case RadGridView fits your requirements I think that is that would be the way to go .
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!