gtk_tree_model_get_iter(GTK_TREE_MODEL(tree_store), &iter, path);
gtk_tree_model_get(GTK_TREE_MODEL(tree_store), &iter, 2, &s, -1);
gtk_tree_path_free(path);
gtk_tree_model_get_iter(GTK_TREE_MODEL(tree_store), &iter, path);
gtk_tree_model_get(GTK_TREE_MODEL(tree_store), &iter, 2, &s, -1);
gtk_tree_path_free(path);