RadDataPager can page anything that correctly implements the IPagedCollectionView interface as described in this blog post. The default implementation of this interface that Microsoft provide is called PagedCollectionView.
In fact, Telerik RadDataPager is fully equivalent to the stock toolkit MS DataPager, so everything that you can do with the stock pager -- you can do with RadDataPager as well.
Placing Silverlight controls in other Silverlight controls goes beyond the scope of Telerik support.
the Telerik team
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