This question does not seem related to any of the controls in the Telerik UI for Silverlight suite, so I'd suggest addressing it either in the MSDN forums or another developer community forum like Stack Overflow.
I also did a quick internet search and there seem to be numerous resources discussing the topic, for example:
If you have any question concerning any of the Telerik controls please let us know and we will gladly assist you.
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.