private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            Map1.MapUnit = GeographyUnit.Meter;
            Map1.CurrentExtent = new RectangleShape(-2500000, 2500000, 2500000, -2500000);
            Map1.ZoomLevelSet = new OpenStreetMapsZoomLevelSet();

            LayerOverlay ov = new LayerOverlay();
            ov.Layers.Add(new GoogleMapsLayer());
            ov.Drawing += new System.EventHandler<DrawingOverlayEventArgs>(ov_Drawing);
            ov.Drawn += new System.EventHandler<DrawnOverlayEventArgs>(ov_Drawn);

            ScaleBarAdornmentLayer scale = new ScaleBarAdornmentLayer();
            scale.Location = AdornmentLocation.LowerLeft;
            //Map1.AdornmentOverlay.Layers.Add(scale);
            Map1.Overlays.Add("ov", ov);
            Map1.Refresh();
        }

        void ov_Drawn(object sender, DrawnOverlayEventArgs e)
        {
            stopWatch.Stop();
            var a = stopWatch.Elapsed.TotalMilliseconds;
        }

        System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();

        void ov_Drawing(object sender, DrawingOverlayEventArgs e)
        { stopWatch.Start(); }

        private void button1_Click(object sender, RoutedEventArgs e)
        { Map1.Pan(90, 90); }