regist contain contain toolbar toolbar hidden contain hidden mean toolbar place panel toolbar hidden panel need hidden param contain contain param toolbar toolbar contain regist contain compon contain tool bar toolbar tool bar toolbar toolbar regist toolbar toolbar tool bar toolbar toolbar toolbar add compon listen compon adapt compon hidden compon event hidden tool bar bar toolbar bar visibl hidden hidden contain set visibl compon shown compon event tool bar visibl tool bar bar toolbar bar visibl visibl bar visibl contain set visibl 