We have checked the functionality of the RadMap.SetView method. It works correctly. The zoom levels, however, are discrete, so one cannot perform a perfect "zoom to fit". One possible approach here would be to zoom the map in by one level after using SetView. In this case, some edge of polygon should be out of view.
If this does not seem to help could you, please, create sample solution which demonstrates the problem and send it to us?
the Telerik team
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