nl_tokens: Sets the listeners .
pl_tokens: function _setListeners ( ) { this . tabBar . on ( 'tabchange' , function ( event ) { _updateView . call ( this , event ) ; this . _eventOutput . emit ( 'tabchange' , { target : this , index : event . index , oldIndex : event . oldIndex , <mask> : this . _items [ event . index ] , oldItem : ( ( event . oldIndex >= 0 ) && ( event . oldIndex < this . _items . length ) ) ? this . _items [ event . oldIndex ] : undefined } ) ; } . bind ( this ) ) ; }