code: function (hide) {
      if(hide) {
        _g.attr('class', 'hide-io');
        _treeData.recursivelyCall('excludeAdditionals');
      }
      else {
        _treeData.recursivelyCall('includeAdditionals');
        _g.attr('class', null);
      }
      _update();
    }
docs: Control display of additionals or sources and sinks.
  @param hide {Boolean} If true the additionals will be excluded, else included in the display