code: function() {
      var elColgroup = this._elColgroup;
      if(elColgroup) {
          var elTable = elColgroup.parentNode;
          Ev.purgeElement(elColgroup, true);
          elTable.removeChild(elColgroup);
          this._elColgroup = null;
      }
  }
docs: Destroy's the DataTable COLGROUP element, if available.
  
  @method _destroyColgroupEl
  @private