These messages are handled by default by the OnNcCreate, On NcCalcSize, and OnGetMinMaxInfo member functions in the CWnd base class. To extend the default message handling, derive a class from CComboBox, add a message map to the new class, and override the preceding message-handler member functions. Override OnCreate, for example, to perform needed initialization for a new class.

CComboBoxCheck\CComboBoxCheck.sln
..............\CComboBoxCheck.suo
..............\CComboBoxCheck.vcproj
..............\CComboBoxCheckDlg.cpp
..............\CComboBoxCheckDlg.h
..............\ComboBoxCheck.cpp
..............\ComboBoxCheck.h
..............\ReadMe.txt
..............\resource.h
..............\stdafx.cpp
..............\stdafx.h
..............\res\01.ico
..............\...\02.ico
..............\...\03.ico
..............\...\04.ico
..............\...\05.ico
..............\...\06.ico
..............\...\07.ico
..............\...\08.ico
..............\...\09.ico
..............\...\10.ico
..............\...\11.ico
..............\...\CComboBoxCheck.ico
..............\...\CComboBoxCheck.manifest
..............\...\CComboBoxCheck.rc2
..............\...\delete_down.ico
..............\...\delete_sel.ico
..............\...\Thumbs.db
..............\CComboBoxCheck.aps
..............\CComboBoxCheck.cpp
..............\CComboBoxCheck.h
..............\CComboBoxCheck.rc
..............\res
CComboBoxCheck

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