private static void OnSymbolRadiusScaleChanged(GeographicSymbolSeries geoSeries, GeoSymbolRadiusScale oldValue, GeoSymbolRadiusScale newValue)
 {
     if (geoSeries == null)
     {
         return;
     }
     if (oldValue != null)
     {
         oldValue.OnDetach(geoSeries);
     }
     if (newValue != null)
     {
         newValue.OnAttach(geoSeries);
     }
 }
 public static void SetSymbolRadiusScale(DependencyObject target, GeoSymbolRadiusScale behavior)
 {
     target.SetValue(SymbolRadiusScaleProperty, behavior);
 }