GtkTreeIter iter;
if (gtk_tree_model_find_string(model, &iter, NULL, 0, is))
gtk_combo_box_set_active_iter(GTK_COMBO_BOX(isw), &iter);
GtkTreeIter iter;
if (gtk_tree_model_find_string(model, &iter, NULL, 0, is))
gtk_combo_box_set_active_iter(GTK_COMBO_BOX(isw), &iter);