Detachable GNOME Menu

[EMCGFX]

I just realized today that most of the gnome menus are not detachable O_O I personally thing its a really great feature, it should be in every app. Now, how would I due this for my main menu in gnome If you don't have a clue what I am talking about, here is couple of screen shots for you.

[rainwalker]

I knew I saw this somewhere! Sorry, took a while to reply cause I couldn't remember where I had seen it
Anyway, it's in gconf-editor under /desktop/gnome/interface/menus_have_tearoff