XamMap can display geo-imagery data from external sources?  Sorry, I'm trying to understand the xammap control for WPF v2010.2.  What I want to do is display a map like Google map with values for the extent, I think in XamWebMap you call it the control’s MapTileSource property (Base Map). If i'm understanding correctly you dont support Google Maps but do support BingMaps, OpenStreetMap, and CloudMade, when the MapTileSource (Base Map) is loaded I want to add my layers on top it. The first layer might be a polygon, the shape (outline) of the county. The secound layer would be more polygons of areas within the county which would match up with the underlying base map, Lat & Long.  Could you please help me wrap my brain around this.  What is the terminology and process about accomplishing this? I understand that this is in testing but I need to get this going ASAP.   Thank you.