protected virtual void DefaultDrawingELayerToXml(XElement root)
        {
            IGraphicsLayer     gLayer = DefaultDrawingELayer.GraphicsLayer;
            IGraphicCollection gc     = IS3Runtime.GraphicEngine.NewGraphicCollection();

            foreach (IGraphic g in gLayer.Graphics)
            {
                gc.Add(g);
            }

            XElement parent = new XElement("DefaultDrawingELayer");
            XElement node   = GraphicsSerializer.GraphicsToXml(gc);

            parent.Add(node);
            root.Add(parent);
        }