Tree and tree item

Can you tell me if I am right, or not.
To create a tree we use gtk_tree_new().
Then to add an object the function gtk_tree_append(tree, item), but you
to initialize first your item by the function gtk_tree_item_new ().
when you need a subtree you initialize a new tree, and attach this tree
to an item.
Just an example, and then my question ....

root_tree = gtk_tree_new ();
root_item = gtk_tree_item_new();
sub_tree = gtk_tree_new ();
gtk_tree_append (root_tree, root_item);
gtk_tree_item_set_subtree (root_item, sub_tree);
sub_item = gtk_tree_item ();
gtk_tree_append (sub_tree, sub_item);
sub_sub_tree = gtk_tree_new ();
gtk_tree_item_set_subtree (sub_item, sub_sub_tree);
sub_sub_item = gtk_tree_item_new ();
gtk_tree_append (sub_sub_tree, sub_sub_item);

if I call a function with this prototype :
void my_function (GtkWidget* sub_sub_item);
How can I find the ROOT_TREE (which is in my example root_tree) ?
When I look to the definition of a GtkTreeItem I have not found a
to its parent...
A known bug, a feature, a forgiven feature ???
If you know how to have its root_tree, can you tell me the way.
Sure I can pass the sub_sub_tree but is this the only solution ?
Florent DEVIN, 33 (0)3 20 43 47 30, Fax (33) (0)3 20 43 65 66 (Fax LIFL)
LIFL, Laboratoire d'Informatique Fondamentale de LILLE
USTL, Bureau 326, Bātiment M3, 59655 Villeneuve d'Ascq Cedex

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