Getting the window handle is not enough to create the OpenGL context on X11. How are you creating the context? Is this done on the C++ side or on C#? If it's the latter, you could just use an OpenTK.GLControl to create a context in your WinForms app and leave everything else the same ( http://www.opentk.com). If it's the former, you'll have to look up how the C++ library creates the context and find a way to pass the necessary information from your app to that (you'll probably need to use reflection in order to access the display connection, screen and visual used by Mono WinForms).
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