First, I'd like to apologize for the late reply. Our navigation framework has no extra features compared to the in-built navigation framework in Silverlight. Our navigation framework was created for Silverlight 2, when such was not available. With the release of Silverlight 3, however, our navigation framework is available only for backward compatibility and we strongly advise to use the in-build Silverlight navigation instead.
All the best,
the Telerik team
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