resizablelib
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How to use it in vs 2019 MFC MDI or MFC SDI?
in vs 2019 ,CFrameWndEx is parent class for CMainFrame
Why don't you make a copy of CResizableFrame to CResizableFrameEx, where you replace CFrameWnd with CFrameWndEx, and use that as the parent of your main frame window?
It might need some tweaks, but that should do it.