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

            WorldMapKitWmsWpfOverlay worldMapKitOverlay = new WorldMapKitWmsWpfOverlay();
            MapArguments a = worldMapKitOverlay.MapArguments;
            wpfMap1.Overlays.Add("WorldMap",worldMapKitOverlay);

            ShapeFileFeatureLayer countries = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Countries02.shp");
            countries.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green));
            countries.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            LayerOverlay StaticOverlay = new LayerOverlay();
             a= StaticOverlay.MapArguments;
            StaticOverlay.TransitionEffect = TransitionEffect.None;
            StaticOverlay.Layers.Add("Countries", countries);
            wpfMap1.Overlays.Add("StaticOverlay", StaticOverlay);

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

        private void CheckBox_Click(object sender, RoutedEventArgs e)// bind all checkboxs’ click event to this “private void  CheckBox_Click(object sender, RoutedEventArgs e)”
        {
            wpfMap1.Overlays.Remove("WorldMap");
            wpfMap1.Overlays.Remove("StaticOverlay");

            LayerOverlay layerOverlay = new LayerOverlay();

            if ((bool)chkWorldMapKit.IsChecked)
            {
                WorldMapKitWmsWpfOverlay worldMapKitDesktopOverlay = new WorldMapKitWmsWpfOverlay();
                wpfMap1.Overlays.Add("WorldMap", worldMapKitDesktopOverlay);
            }

            if ((bool)chkCountries.IsChecked)
            {
                ShapeFileFeatureLayer countries = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Countries02.shp");
                countries.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green));
                countries.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                layerOverlay.Layers.Add("Countries", countries);
            }

            if ((bool)chkUsStates.IsChecked)
            {
                ShapeFileFeatureLayer usStates = new ShapeFileFeatureLayer(@"..\..\sampledata\data\usStates.shp");
                usStates.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.State1;
                usStates.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                layerOverlay.Layers.Add("usStates", usStates);
            }

            if ((bool)chkWorldCapitals.IsChecked)
            {
                ShapeFileFeatureLayer worldCapitals = new ShapeFileFeatureLayer(@"..\..\sampledata\data\worldCapitals.shp");
                worldCapitals.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital1;
                worldCapitals.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                layerOverlay.Layers.Add("worldCapitals", worldCapitals);
            }

            if ((bool)chkMajorCities.IsChecked)
            {
                ShapeFileFeatureLayer MajorCities = new ShapeFileFeatureLayer(@"..\..\sampledata\data\MajorCities.shp");
                MajorCities.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.City1;
                MajorCities.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                layerOverlay.Layers.Add("MajorCities", MajorCities);
            }
            wpfMap1.Overlays.Add("StaticOverlay", layerOverlay);

            if (wpfMap1.Overlays.Contains("WorldMap")) { wpfMap1.Refresh(wpfMap1.Overlays["WorldMap"]); }

            wpfMap1.Refresh(wpfMap1.Overlays["StaticOverlay"]);
        }