private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;

            WorldMapKitWmsWpfOverlay worldMapKitOverlay = new WorldMapKitWmsWpfOverlay();
            wpfMap1.Overlays.Add(worldMapKitOverlay);
            
            ShapeFileFeatureLayer worldLayer = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Countries02.shp");
            worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green));
            worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            
            LayerOverlay layerOverlay = new LayerOverlay();
            layerOverlay.Drawing += new System.EventHandler<DrawingOverlayEventArgs>(layerOverlay_Drawing);
            layerOverlay.Drawn += new System.EventHandler<DrawnOverlayEventArgs>(layerOverlay_Drawn);
            layerOverlay.TransitionEffect = TransitionEffect.None;
            layerOverlay.Layers.Add("WorldLayer", worldLayer);
            wpfMap1.Overlays.Add("WorldOverlay", layerOverlay);

            wpfMap1.CurrentExtent = new RectangleShape(-133.2515625, 89.2484375, 126.9046875, -88.290625);
            wpfMap1.Refresh();
        }

        void layerOverlay_Drawn(object sender, DrawnOverlayEventArgs e)
        {
            stopWatch.Stop();
            MessageBox.Show("This Overlay Used:" + stopWatch.Elapsed.TotalMilliseconds.ToString() + "ms");
        }
        System.Diagnostics.Stopwatch stopWatch=new System.Diagnostics.Stopwatch();
        void layerOverlay_Drawing(object sender, DrawingOverlayEventArgs e)
        {
            stopWatch.Start();
        }