The RadControls for Silverlight suite is different from RadControls for Windows Phone since both platforms require controls that should follow different user experience patterns. So, what's included in RadControls for Silverlight is not meant to work on Windows Phone although the Windows Phone platform is based on Silverlight.
We have considered porting our PDF Viewer for Silverlight to Windows Phone but for now I cannot give you an exact estimation whether we will do this and when.
Let me know in case you have further questions.
the Telerik team
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