I use GNOME Flashback (Metacity) in my Ubuntu 14.04 LTS installation because of performance (it's running in VirtualBox). In this mode, the menu bar of an application is usually placed below its title bar. Recently I downloaded Qt Creator (version 3.0.1-0ubuntu4) and it shows no menu bar in my GUI.
When I switch to Unity (called Ubuntu (default) in the chooser), the Qt Creator's menu is displayed correctly when I hover the mouse cursor over the top bar.
Is there any way to show AppMenu in GNOME Flashback? What should I do to use Qt Creator correctly with GNOME Flashback?