public X3DBrowser(VSyncMode VSync, string url, Resolution res, GraphicsMode mode) : base(res.Width, res.Height, mode)
        {
            this.VSync = VSync;
            this.URL   = url;

            app = new X3DApplication(this);
        }
        public X3DBrowser(VSyncMode VSync, SceneGraph graph, Resolution res, GraphicsMode mode) : base(res.Width, res.Height, mode)
        {
            this.VSync = VSync;
            this.URL   = string.Empty;
            this.Graph = graph;

            app = new X3DApplication(this, graph);
        }