How to get a GtkMenuItem parent

[André Pedralho <apedralho gmail com>]

I'm developing an app that creates a menu from a file. Then it would
have many submenus. I'm trying to make it in a recursive function, but
I am looking for a way to up the tree.

For example:

root
|
sub-root
|     |
|      itens_here
|     |
|     sub-sub-root
|          |
|          itens_here
|
sub-root2
      |
      itens_here

I wanna know how to get 'root' from 'sub-root'. 
e.g gtk_menu_item_get_parent(sub-root) - it would return root!

BR

-- 
André Pedralho
Bachelor in Computer Science
Instituto Nokia de Tecnologia