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

            WorldMapKitWmsWpfOverlay worldMapKitOverlay = new WorldMapKitWmsWpfOverlay();
            wpfMap1.Overlays.Add(worldMapKitOverlay);
            wpfMap1.EditOverlay.VertexMoving += new System.EventHandler<VertexMovingEditInteractiveOverlayEventArgs>(EditOverlay_VertexMoving);
            wpfMap1.Refresh();
        }

        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;
        }