title: I can't take image from opengl screen
body: <pre><code>OpenGLWindow(); 
  opl = new OpenGLWindow();
  opl.Parent = panel1;
  opl.Dock = DockStyle.Fill;
  opl.Refresh();
  </code></pre>
  
  <p>here the code. I can take picture of panel1 but I can't take openGL picture. The question is: how can I take OpenGL screenshot</p>
  
  <pre><code>var frm = Panel1;
  using (var bmp = new Bitmap(frm.Width, frm.Height))
  {
      frm.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height));
      bmp.Save(@"c:\screenshot.Jpeg");
  }
  </code></pre>