control of the notebook open button available/not available, the principle is : Use window enumeration method checks the notebook and then get menu, the corresponding menu greyed

MenuCtrl
........\MenuCtrl.aps
........\MenuCtrl.clw
........\MenuCtrl.cpp
........\MenuCtrl.dsp
........\MenuCtrl.dsw
........\MenuCtrl.h
........\MenuCtrl.ncb
........\MenuCtrl.opt
........\MenuCtrl.plg
........\MenuCtrl.rc
........\MenuCtrlDlg.cpp
........\MenuCtrlDlg.h
........\ReadMe.txt
........\res

........\...\MenuCtrl.rc2
........\resource.h
........\StdAfx.cpp
........\StdAfx.h

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