I am afraid that there is no "out of the box" way to achieve the described behavior. What you can try is to place the TileList control in a ScrollViewer. Please check the attached sample project for a reference.
Regards,
Yoan
Telerik
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos and start improving your app based on facts, not hunches.