What are the good layout managers for MFC apps ?
I have used this CSizingDialog class several times:
http://www.codeproject.com/Articles/11538/Resize-Reposition-the-Controls-in-a-Dialog-at-your
However, are you aware that in Visual Studio 2015 you can use the resource editor itself to manage control resizing? The concept is tricky to get your head around, but when you use it right you need no additional layout manager.