question: public static MenuSelectionManager defaultManager ( ) { synchronized ( MENU_SELECTION_MANAGER_KEY ) { AppContext context = AppContext . getAppContext ( ) ; MenuSelectionManager msm = ( MenuSelectionManager ) context . get ( MENU_SELECTION_MANAGER_KEY ) ; if ( msm == null ) { msm = new MenuSelectionManager ( ) ; context . put ( MENU_SELECTION_MANAGER_KEY , msm ) ; Object o = context . get ( SwingUtilities2 . MENU_SELECTION_MANAGER_LISTENER_KEY ) ; if ( o != null && o instanceof ChangeListener ) { msm . addChangeListener ( ( ChangeListener ) o ) ; } } return msm ; } }
target:  Returns the default menu selection manager.