public void createVirtualEarthLayer(string key)
    {
        BaseVirtualEarthLayer layer = MapImplementation.createVirtualEarthLayer();

        layer.Key = key;
        MapImplementation.SetActiveVirtualEarthLayer(layer);
        Layers.Add(layer);
    }
 public void createVirtualEarthLayer()
 {
     Layers.Add(MapImplementation.createVirtualEarthLayer());
 }