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

            ShapeFileFeatureLayer countries02Layer = new ShapeFileFeatureLayer(@"..\..\sampledata\data\countries02.shp");
            countries02Layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            countries02Layer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Country1;

            ShapeFileFeatureLayer usStatesLayer = new ShapeFileFeatureLayer(@"..\..\sampledata\data\usstates.shp");
            usStatesLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            usStatesLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Water1;

            LayerOverlay ov = new LayerOverlay();
            ov.Layers.Add(countries02Layer);
            ov.Layers.Add(usStatesLayer);


            countries02Layer.Open();
            Map1.CurrentExtent = countries02Layer.GetBoundingBox();
            countries02Layer.Close();

            Map1.Overlays.Add(ov);
            Map1.Refresh();
        }