That’s almost certainly not the case but I can’t guarantee that. You see, editors visible in in the inspector can be constructed via user-specified C# classes, and the way those classes work have nothing to do with MFC.
If you’re studying C++ and looking for a GUI library, the best idea would be to avoid MFC completely and use Qt 5 instead. I can’t honestly think of any reason to even consider MFC unless you’re maintaining some legacy code which is already written using MFC.