private void Initialize()
{
// Create a map with 'Imagery with Labels' basemap and an initial location
Map myMap = new Map(Basemap.CreateTopographic());
// Create graphics overlay with graphics
CreateOverlay();
// Hook into tapped event
MyMapView.GeoViewTapped += OnMapViewTapped;
// Assign the map to the MapView
MyMapView.Map = myMap;
}