code: function() {
      var aKeys = this._oColumnSet.keys;
      for(var i=0, len=aKeys.length; i<len; i++) {
          if(aKeys[i]._ddResizer) {
              aKeys[i]._ddResizer = aKeys[i]._ddResizer.unreg();
              Dom.removeClass(aKeys[i].getThEl(), DT.CLASS_RESIZEABLE);
          }
      }
  }
docs: Disables resizeability on key Column TH elements.
  
  @method _destroyResizeableColumns
  @private