gtk_tree_view_column_set_sort_column_id(col, 3);
gtk_tree_view_column_pack_start(col, renderer, FALSE);
gtk_tree_view_column_add_attribute(col, renderer, "text", 2);
gtk_tree_view_column_set_sort_column_id(col, 3);
gtk_tree_view_column_pack_start(col, renderer, FALSE);
gtk_tree_view_column_add_attribute(col, renderer, "text", 2);