sort a treeview

["vivien popo" <shadelv hotmail com>]

hi people !
is there a way to define how a treemodelsort must sort its items ?
i think i can use :
gtk_tree_sortable_set_sort_func
                                            (GtkTreeSortable *sortable,
                                            gint sort_column_id,
                                            GtkTreeIterCompareFunc 
sort_func,
                                            gpointer user_data,
                                            GtkDestroyNotify destroy)
but i don't know what are GtkTreeIterCompareFunc and GtkDestroyNotify...

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