Since you need to filter the RadTreeView ItemsSource
collection, it is best to create data classes, which to wrap the XML data objects. This will allow you to filter the data class collections similarly to what the Filter/Search/Sort demo in Silverligth demonstrates.
Also, you will need to create a temp collection, on which to apply the filters, while keeping the original so that you can set it back as RadTreeView ItemsSource
when no filtering is applied.
Please examine the attached solution and let us know if it works for you.
the Telerik team
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