Function
Gtk.TreeListModelCreateModelFunc
Description [src]
Prototype of the function called to create new child models when
gtk_tree_list_row_set_expanded()
is called.
This function can return NULL
to indicate that item
is guaranteed to be
a leaf node and will never have children.
If it does not have children but may get children later, it should return
an empty model that is filled once children arrive.