I'm trying to implement a tree view that represent structure of buildings/floors/rooms. All rooms should be classified by floor and building ( thus header for each building and floor is required.

First I implemented it with Repeater, Row and Grid elements. However I need a selection behaviour so i need to use ListView and GridView. I have problems displaying nested list views.

Here's my code so far: http://pastie.org/private/3seqntgvskbyxnmnuluaua

When using Repeater and Grid instead of GridView the result is:
!https://docs.google.com/file/d/0B-mc4aKkzWlxczg2TzhuTFgwWjQ/edit?usp=sharing()!