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

            ShapeFileFeatureLayer shpLayer = new ShapeFileFeatureLayer(@"..\..\sampledata\data\majorcities.shp"); shpLayer.Open();
            shpLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            ValueStyle valueStyle = new ValueStyle("AREANAME", new System.Collections.ObjectModel.Collection<ValueItem>());
            valueStyle.ValueItems.Add(new ValueItem("New York", new PointStyle(new GeoFont("Arial", 20), 78, new GeoSolidBrush(GeoColor.StandardColors.Red))));
            valueStyle.ValueItems.Add(new ValueItem("Miami", new PointStyle(new GeoFont("Arial", 20), 77, new GeoSolidBrush(GeoColor.StandardColors.Red))));
            shpLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(valueStyle);

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

            Map1.Overlays.Add(ov);
            Map1.CurrentExtent = shpLayer.GetBoundingBox();
            Map1.Refresh();
        }