Can't keep button centered on window size change

[jminnie]

When I maximize the screen in my dialog the buttons don't stay centered. I'm using" DT_AutoSizeControls" to move them, but they are offset to the right of the dialog window instead of centered when the window is full screen. If you restore the dialog, they move back to center. Am I using the wrong command?

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DT_AutoSizeControls hDlg message "20mh 21mh 22mh 23mhh"