We do not have such an example.
There is a Silverlight example
with a Domain Data Source which can get you started.
It is not for WPF, but the idea here is the important thing. The idea behind RadDataFilter is a simple one. Use the UI to create FilterDescriptors and then use the information contained in these FilterDescriptors for anything that you need. It can be virtually anything.
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>>