Please provide a bit more information about your requirement. What do you mean by "hide items 8 and 7 from 6" ? What is the exact behavior and outlook you want to achieve ?
the Telerik team
See What's New in RadControls for WPF in Q3 2010 on Tuesday, November 16, 2010 11:00 AM - 12:00 PM EST or 10:00 PM - 11:00 PM EST: Register here>>