Overriding the maximize button for the main window in a MDI application

I am looking for a way to override the maximize button for the main window in an MDI application. I have found several articles telling me how to override the maximize button for the child window, but not the main window. What I need is when the User clicks on the maximize button the application maximizes itself to two monitors instead of just one monitor. I hope that somebody can help me.

I never did it myself but guess that reading MSDN articles with some code examples would be a good start:
Positioning Objects on a Multiple Display Setup
Positioning Objects on Multiple Display Monitors
How to Exploit Multiple Monitor Support in Memphis and Windows NT 5.0

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Originally Posted by berger_the_great

I am looking for a way to override the maximize button for the main window in an MDI application. I have found several articles telling me how to override the maximize button for the child window, but not the main window. What I need is when the User clicks on the maximize button the application maximizes itself to two monitors instead of just one monitor. I hope that somebody can help me.

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Are you talking about the frame window (CMainFrame)? Handle the WM_SYSCOMMAND message (OnSysCommand() in the main frame window) and intercept the SC_MAXIMIZE command.

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Originally Posted by hoxsiew

Are you talking about the frame window (CMainFrame)? Handle the WM_SYSCOMMAND message (OnSysCommand() in the main frame window) and intercept the SC_MAXIMIZE command.

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Thank you that was extremely helpful :)

Perhaps handling the WM_GETMINMAXINFO message would help.