I am trying to inherit from Micorsoft MFC CFrameWnd, in order to customize some specific function. This is a sample of my code:

void
MyClass::OnNcPaint() {
    
    if ( ! custom)
        return ::OnNcPaint() ;
    
    CustomDraw() ;

}

My custom FrameWnd is hosting an OpenGL view.

It used to work quite well, but many problems arised as soon as I moved to Win 11, like the position of the window.

It seems that something has changed on dafault WM_NCPAINT handling running with Nvidia OpenGL provider.

Is it possible to see what did change between Win10 and Win11 or anyone has already met and solved this issue?

I tried to define a callback to DefWindowProc, that’s fixed the main issue but I get a lot of flickers.