code: function(e) {
      var nKey = Ev.getCharCode(e);
  
      if((nKey == 38) || (nKey == 40)) {
          var bSHIFT = e.shiftKey;
  
          // Validate trigger
          var oTrigger = this._getSelectionTrigger();
          // Arrow selection only works if last selected row is on current page
          if(!oTrigger) {
              return null;
          }
  
          Ev.stopEvent(e);
  
          // Validate anchor
          var oAnchor = this._getSelectionAnchor(oTrigger);
  
          // Determine which direction we're going to
          if(bSHIFT) {
              // Selecting down away from anchor row
              if((nKey == 40) && (oAnchor.recordIndex <= oTrigger.trIndex)) {
                  this.selectRow(this.getNextTrEl(oTrigger.el));
              }
              // Selecting up away from anchor row
              else if((nKey == 38) && (oAnchor.recordIndex >= oTrigger.trIndex)) {
                  this.selectRow(this.getPreviousTrEl(oTrigger.el));
              }
              // Unselect trigger
              else {
                  this.unselectRow(oTrigger.el);
              }
          }
          else {
              this._handleSingleSelectionByKey(e);
          }
      }
  }
docs: Determines selection behavior resulting from a key event when selection mode
  is set to "standard".
  
  @method _handleStandardSelectionByKey
  @param e {HTMLEvent} Event object.
  @private