Hi Iosu Buenetxea,
Prior to adding the Silverlight Report Viewer you have to download and install RadControls for Silverlight 4. The Silverlight Report Viewer is depending on the following assemblies:
RadControls for Silverlight 4 assemblies:
Telerik Report Viewer assembly:
For a demo project you can check out the demos that came with your installation of Telerik Reporting
Start -> All Programs -> Telerik -> Reporting Q1 2010.
For a video how to check out Getting Started with Telerik Report Viewer for Silverlight
the Telerik team
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