You can implement the IPagedCollectionView interface in any way that you need and embed any logic that you need.
Implementing the IPagedCollectionView interface is beyond the scope of Telerik support since this is a core Silverlight interface, i.e. you can use the stock Silverlight Toolkit Microsoft DataPager and your implementation of IPagedCollectionView to do the endless paging. Once you can do that, you can simply replace the stock DataPager with RadDataPager -- they are absolutely the same. So this question is not really related to Telerik controls.
All the best,
the Telerik team
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