The WmsTiledProvider is not exclusive to GeoServer. We have not got the installed MapServer to check compatibility with RadMap. In theory the WmsTiledProvider should support any WMS-based systems. But note, the tiles which are returned by the map server for different zoom levels must be compatible with the DeepZoom concept. The tiles should have the same size for different zoom levels. Also one tile from the previous zoom level should be covered by four tiles from next zoom level. I.e. it should be 1 tile for level 0, 4 tiles for level 1 etc.
the Telerik team