I am using Ubuntu 12.04 with unity and quickly with glade 3.12.1.

I am following this tutorial and when I am adding buttons into a verical button box, I am setting them as stock buttons (gtk-goto-top for example) but rather than displaying the icon, it's just displaying the name of the icon.

I have ready that this was a setting in gnome which you could use gconf-editor to fix, however because I am using unit, how would I fix this?