code: function(row) {
      var nThisTrIndex = this.getTrIndex(row);
      if(nThisTrIndex !== null) {
          var allRows = this._elTbody.rows;
          if(nThisTrIndex < allRows.length-1) {
              return allRows[nThisTrIndex+1];
          }
      }
  
      return null;
  }
docs: Returns DOM reference to the next TR element from the given TR element, or null.
  
  @method getNextTrEl
  @param row {HTMLElement | String | Number | YAHOO.widget.Record} Element
  reference, ID string, page row index, or Record from which to get next TR element.
  @return {HTMLElement} Reference to next TR element.