evas_object_smart_callback_add(btn, "clicked", btn_end_cb, ao);
evas_object_smart_callback_add(btn, "clicked", _btn_clicked_cb, str);
evas_object_smart_callback_add(btn, "clicked", btn_end_cb, ao);
evas_object_smart_callback_add(btn, "clicked", _btn_clicked_cb, str);