anchor.diff:    void set iconCssClass   (_) => _opt['iconCssClass']   = _;
     void set iconImage      (_) => _opt['iconImage']      = _;
     void set tooltip        (_) => _opt['tooltip']        = _;
  -  set disabled       (bool _) => _opt['disabled']       = _;
  + // set disabled       (bool _) => _opt['disabled']       = _;
   }
  
positive.code:   MenuFun  _handleMenuItemClickFun(Function f,Column column,MenuItem item) => (MouseEvent e) => f(column,item,e);
      _menuItemClick(Column column,MenuItem item,MouseEvent e) {
        _log.finest('click:${column.name} ${item.command}');
  
        if (item.disabled) {
          return;
  
negative.code:     });
    }
    String get title =>        _opt['title'];
  //  bool get disabled =>     _opt['disabled'];
    String get command =>      _opt['command'];
    String get iconCssClass => _opt['iconCssClass'];
    String get iconImage =>    _opt['iconImage'];
  