store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_STRING);
dd->filter_combo = gtk_combo_box_new_with_model_and_entry(GTK_TREE_MODEL(store));
store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_STRING);
dd->filter_combo = gtk_combo_box_new_with_model_and_entry(GTK_TREE_MODEL(store));