private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;
            wpfMap1.CurrentExtent = new RectangleShape(-133.2515625, 89.2484375, 126.9046875, -88.290625);


            InMemoryFeatureLayer inMemoryLayer = new InMemoryFeatureLayer();
            inMemoryLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.SimpleColors.Green, 3, GeoColor.SimpleColors.Black, 1, true);
            inMemoryLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            WorldMapKitWmsWpfOverlay worldMapKitOverlay = new WorldMapKitWmsWpfOverlay();
            wpfMap1.Overlays.Add(worldMapKitOverlay);

            LayerOverlay overlay = new LayerOverlay();
            overlay.Layers.Add("mark", inMemoryLayer);
            wpfMap1.Overlays.Add("Maps", overlay);

            wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures.Add(new Feature(new RectangleShape(-50, 50, 50, -50)));
            wpfMap1.EditOverlay.VertexMoving += new System.EventHandler<VertexMovingEditInteractiveOverlayEventArgs>(EditOverlay_VertexMoving);
            wpfMap1.EditOverlay.CalculateAllControlPoints();
            wpfMap1.Refresh();
        }

        private void EditOverlay_VertexMoving(object sender, VertexMovingEditInteractiveOverlayEventArgs e)
        {
            e.TargetVertex.X += 5; //= new PointShape(e.MovingVertex.X + 5, e.MovingVertex.Y + 5);
            e.TargetVertex.Y += 5;

            LayerOverlay overlay = (LayerOverlay)wpfMap1.Overlays["Maps"];
            ((InMemoryFeatureLayer)overlay.Layers["mark"]).InternalFeatures.Clear();

            ScreenPointF point = ExtentHelper.ToScreenCoordinate(wpfMap1.CurrentExtent, e.TargetVertex, (float)wpfMap1.ActualWidth, (float)wpfMap1.ActualHeight);

            ScreenPointF point1 = new ScreenPointF(point.X, point.Y + 15);
            ScreenPointF point2 = new ScreenPointF(point.X, point.Y - 15);
            ScreenPointF point3 = new ScreenPointF(point.X + 15, point.Y);
            ScreenPointF point4 = new ScreenPointF(point.X - 15, point.Y);

            GeoCollection<Vertex> line1 = new GeoCollection<Vertex>();
            GeoCollection<Vertex> line2 = new GeoCollection<Vertex>();

            line1.Add(new Vertex(ExtentHelper.ToWorldCoordinate(wpfMap1.CurrentExtent, point1, (float)wpfMap1.ActualWidth, (float)wpfMap1.ActualHeight)));
            line1.Add(new Vertex(ExtentHelper.ToWorldCoordinate(wpfMap1.CurrentExtent, point2, (float)wpfMap1.ActualWidth, (float)wpfMap1.ActualHeight)));
            line2.Add(new Vertex(ExtentHelper.ToWorldCoordinate(wpfMap1.CurrentExtent, point3, (float)wpfMap1.ActualWidth, (float)wpfMap1.ActualHeight)));
            line2.Add(new Vertex(ExtentHelper.ToWorldCoordinate(wpfMap1.CurrentExtent, point4, (float)wpfMap1.ActualWidth, (float)wpfMap1.ActualHeight)));

            ((InMemoryFeatureLayer)overlay.Layers["mark"]).InternalFeatures.Add(new Feature(new LineShape(line1)));
            ((InMemoryFeatureLayer)overlay.Layers["mark"]).InternalFeatures.Add(new Feature(new LineShape(line2)));

            wpfMap1.Refresh();
        }