code: function() {
      var aSelectedCells = [];
      var tracker = this._aSelections || [];
      for(var j=0; j<tracker.length; j++) {
         if(tracker[j] && lang.isObject(tracker[j])){
              aSelectedCells.push(tracker[j]);
          }
      }
      return aSelectedCells;
  }
docs: Returns selected cells as an array of object literals:
  {recordId:sRecordId, columnKey:sColumnKey}.
  
  @method getSelectedCells
  @return {Object[]} Array of selected cells by Record ID and Column ID.