GLayer
Code.aspx
<cc1:GMap ID="GMap1" runat="server" />
Code.aspx.cs
GLayer layerPanoramio = new GLayer(GLayerID.All_photos_from_panoramio_com);
GMap1.addGLayer(layerPanoramio);
GLayer layerWikipedia = new GLayer(GLayerID.Geotagged_Wikipedia_articles_Spanish);
GMap1.Add(layerWikipedia);