Could you please provide more information about the problem you are experiencing? A sample project, or live url where the issue can be observed, will help us a lot in giving you an adequate solution.
Please observe our online demos, where you can see the RadButton in action, and will see how to use the different types of buttons:
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!