I need to render a surface as shaded with the wireframe overtop.
The general sequence is a two pass:

GL.PolygonMode( frontandback, fill )
glGraphics.Paint(ClientSize.Width, ClientSize.Height) //Pass 1: Render the model as shaded
GL.PolygonMode( frontandback, line)
GL.PolygonOffset(1,1)
glGraphics.Paint(ClientSize.Width, ClientSize.Height) //Pass2: Render the model in wireframe
SwapBuffer

The problem is that Pass1 paint also does the swapbuffer.
Is there another way to do this? Or perhaps an enhancement?

Regards

An approach that seems to work:
derive new class from GLGraphics3D and override OnDrawScene to draw two pass
e.g

base.OnDrawScene(e); // pass 1

GL.PolygonMode( frontandback, line)
GL.PolygonOffset(1,1)

base.OnDrawScene(e); // pass 2
// reset modes and offset

Any other suggestions welcome!

Regards