All Telerik Reports have to be created either via the Report Designer
or entirely with code, there is no way to simply "clicking on that button" and have your Silverlight controls in a report. If your goal is to print a page with Silverlight controls on it, then use the Silverlight document print.
the Telerik team
Q3’11 of Telerik Reporting is available for download. Register for the What's New in Data Tools webinar to see what's new and get a chance to WIN A FREE LICENSE!