code: function() {
      var tracker = this._aSelections;
      if(tracker && tracker.length > 0) {
          for(var i=tracker.length-1; i>-1; i--) {
             if(tracker[i].recordId && tracker[i].columnKey){
                  return tracker[i];
              }
          }
      }
  }
docs: Returns last selected cell as an object literal:
  {recordId:sRecordId, columnKey:sColumnKey}.
  
  @method getLastSelectedCell
  @return {Object} Object literal representation of a cell.