MDI frame / view - how to detect maxmise / restore?

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C++

MFC

MDI

I have an MFC MDIFrame / View architecture. When the child frame/view is resized I want to resize some of the displayed controls.

So, in my CMDIChildWnd, I handle OnExitSizeMove, because I don't want to recalculate on every OnSize message. This works fine, but not when the child is maxmised or restored.

I thought it would be easy to check in my view's OnSize event for nType == SIZE_MAXIMIZED, but for some reason it is always equal to SIZE_MAXIMIZED.

How can I detect my MDIChild's maximise / restore events?

What I have tried:

I tried catching every combination of size, window position and resizing messages I could think of. Both in my view and my child frame, using the function overrides and even through PreTranslateMessage, I just can't usefully detect this simple event.

It's driving me mad.