private void DrawLayers(Graphics clientDC, Rectangle clipRectangle)
{
if (_mapLayer.Terminating)
{
return;
}
//clientDC.Clear(Color.White);
_mapLayer.DrawBufferToScreen(clientDC, clipRectangle);
_netLayer.DrawBufferToScreen(clientDC, clipRectangle);
_imageLayer.DrawBufferToScreen(clientDC, clipRectangle);
}