* @model: (allow-none): the #GtkTreeModel to build the menu heirarchy from, or %NULL.
* @root: (allow-none): the #GtkTreePath indicating the root row for this menu, or %NULL.
*
* @model: (allow-none): the #GtkTreeModel to build the menu heirarchy from, or %NULL.
* @root: (allow-none): the #GtkTreePath indicating the root row for this menu, or %NULL.
*