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How to disable dialog close button in upper right corner?
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See this post[^] here on Codeproject and its answers, they might be of help.
 
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You can do it this way:

C++
CMenu* pMenu = GetSystemMenu(FALSE);
if (pMenu != NULL)
   pMenu->EnableMenuItem(SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);
 
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