code: function() {
          // If Drag and Drop utility is available...
          // ...and draggable is true...
          // ...then make the header draggable
          if(u.DD && this.draggable && this._elHd) {
              var ylog_dd = new u.DD(this._elContainer);
              ylog_dd.setHandleElId(this._elHd.id);
              //TODO: use class name
              this._elHd.style.cursor = "move";
          }
      }
docs: Initializes Drag and Drop on the header element.
  
  @method _initDragDrop
  @private