code: function tabView_getGroupTitleBox(aSpec) {
      var spec = aSpec || {};
      var group = spec.group;
  
      if (!group) {
        throw new Error(arguments.callee.name + ": Group not specified.");
      }
  
      return this.getElement({
        type: "group_titleBox",
        parent: spec.group
      });
    }
docs: Retrieve the group's title box
  
  @param {object} aSpec
  Information on which group to operate on
  Elements: group - Group element
  
  @returns Group title box
  @type {ElemBase}