protected override void OnRenderFrame(FrameEventArgs e)
{
GL.ClearColor(Color.RGB(1.0, 1.0, 1.0));
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
GUIRenderContext rc = new GUIRenderContext(this.ViewSize);
rc.Setup();
this._Control.Render(rc);
this.SwapBuffers();
}