private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            Map1.MapUnit = GeographyUnit.DecimalDegree;

            InMemoryFeatureLayer pointLayer = new InMemoryFeatureLayer();
            pointLayer.InternalFeatures.Add(new Feature(0, 0));
            pointLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle.Image = GetGeoImageFromNet("http://maps.google.com/mapfiles/kml/shapes/shaded_dot.png");
            pointLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle.PointType = PointType.Bitmap;
            pointLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            LayerOverlay ov = new LayerOverlay();
            ov.Layers.Add(pointLayer);

            Map1.Overlays.Add(ov);
            Map1.CurrentExtent = new RectangleShape(-155.733, 95.60, 104.42, -81.9);
            Map1.Refresh();
        }

        public GeoImage GetGeoImageFromNet(string url)
        {
            MemoryStream ms = new MemoryStream(new WebClient().DownloadData(url));
            return new GeoImage(ms);
        }