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You can use GetWindowLong() and SetWindowLong().


DWORD styles = ::GetWindowLong(hWnd, GWL_STYLE);
styles &= ~WS_BORDER;
::SetWindowLong(hWnd, GWL_STYLE, styles);

I'm not sure this is going...

You want to remove the border of the buttons on a dialog box? Or you want to remove the border of a dialog box? I'm a little bit confused here.

Without owner draw, you could try to use the BS_FLAT...