Getting a menubar to work under Ubuntu 14.10?

[Izak van Langevelde <eezacque xs4all nl>]

I cannot figure out how to set up a menubar through 
gtk_application_set_menubar(), or an application menu through 
gtk_application_set_app_menu, and get it to work in Ubuntu 14.10. I had 
it working in the past, but I suspect something has changed in either 
GTK+ 3.0 or Ubuntu, recently. To make sure the problem is not in my 
code, I downloaded and built the example application 
https://developer.gnome.org/gtk3/stable/ch01s05.html, which doesn't give 
me an application menu, either.

Did anyone out there get this working, recently?

Thanks,
Izak

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