'How to catch leaving focus from active window

I have window with CTabsCtrl - with child window. I need to catch situation, when user leave rigth window (window with brown border and blue background) and click to ctreectrl on the left (marked with yellow border). I tried WW_LOST_FOCUS but it doesn't work.

How to do it?

(I need to save value in right window since user change item in CtreeCtrl)

Thanks for help.enter image description here

c++windowswinapimessaging


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