Using the window subclassing method, make an MDI application automatic pop-up message box when closing the window, the user to select "ok" button to close the window, the user to select "cancel" button is not closing the window.

test2
.....\MDIDemo.rc
.....\quiz.cpp
.....\quiz2.dsp
.....\quiz2.dsw
.....\quiz2.ncb
.....\quiz2.opt
.....\quiz2.plg
.....\RESOURCE.H

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