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The framework calls this member function when the CWnd object is minimized and the user requests that the CWnd be restored to its preminimized size and position.

afx_msg BOOL OnQueryOpen( );

Nonzero if the icon can be opened, or 0 to prevent the icon from being opened.

While in OnQueryOpen, CWnd should not perform any action that would cause an activation or focus change (for example, creating a dialog box).

Header: afxwin.h