The RadMap has limited KML support. Currently the map control supports the following KML elements:
3. Polygon (including outerBoundaryIs and innerBoundaryIs)
4. Styles: IconStyle (partial support, including hotspot and scale), LineStyle, PolyStyle
7. Partial support for MultiGeometry tag.
Unfortunately your KML has not an information which can be used by RadMap to show tooltips and legend (these features require ExtendedData in the KML).
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