In your online example, when I click a tile, it is 'checked' in the top right corner and the border changes. This only works in my own code when I'm not using an itemsource... is this a bug or am I missing something? So, as an example, your code here does not work correctly; http://www.telerik.com/help/wpf/radtilelist-getting-started-populating-with-tiles.html