new MenuItem(&onSave, "_Save", "file.save", true, accelGroup, 's');

Now onSave will be called when the menu item is clicked and when the Window receives Crtl+S.

Where is 'Ctrl' at?

Is "_Save" for using Alt + S?

P.S. I'd be faster at replying if I got notified by e-mail, I think. I forget about these posts.