The easiest way to achieve this is to handle the TileStateChanged event and in it to set the style for the current item. Could you please examine the attached project and if you have any further questions feel free to ask?
All the best,
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