I'm attaching you a working example containing two instances of RadTreeView. First tree is declared inline. Second one is populated via a data binding. In both cases the font is changed to italic when the item is selected.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items