OpenGLControl Undocking Issue

I have a Form with OpenGLControl inside (C# program).

Those are the properties:

_glcontrol.RenderContextType = RenderContextType.NativeWindow;
_glcontrol.RenderTrigger = RenderTrigger.TimerBased;
_glcontrol.OpenGLVersion = SharpGL.Version.OpenGLVersion.OpenGL4_4;

When the Window is undocked the OpenGLControl become White and I can't restore the control over the component.

Any idea in order to resolve this issue?

thank you very much
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