I used the fix provided in the issue page to get the NativeWindow render context to work in WPF, but I still have a problem :
When using NativeWindow, the OpenGLControl cover the entire window, even if a fixed sized is defined.
The background color covers the whole screen, but the objects rendered are only in an area of the specified size, in the bottom left corner.
The fps text is rendered completely, even if it is larger than the width specified.
Other WPF controls can be briefly seen at their correct position, when the mouse move over them.