Disable the Close system menu for MDI child window

How can I disable the Close ("x") button of the MDI child window ?

I tried to add the following code in the OnCreate virtual function of my child frame class:

CMenu * psysmenu = GetSystemMenu( FALSE );
psysmenu->EnableMenuItem( SC_CLOSE, MF_DISABLED | MF_BYCOMMAND | MF_GRAYED );

It worked as long as the child window is not maximized, but if the child window is maximized then the "x" button is not disabled.
ehandojoAsked:
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Tommy HuiEngineerCommented:
You can try catching the WM_SYSCOMMAND and checking if (WPARAM & SC_CLOSE) == SC_CLOSE. If it is, then don't call the base class.
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galkinCommented:
You must resiter your window class with style CS_NOCLOSE. If you use MFC overwrite your frame PreCreateWindow and register new class by calling AfxRegisterWndClass(CS_NOCLOSE);. You can add other styles using bitwise OR operator. then assign class name returned by AfxRegisterWndClass to lpszClass field of CREATESTRUCT structure and call base class PreCreateWindow implementation.
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System Programming

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