code: function() {
      // Remove all rows from tracker
      var tracker = this._aSelections || [],
          recId,
          removed = [];
      for(var j=tracker.length-1; j>-1; j--) {
         if(lang.isString(tracker[j])){
              recId = tracker.splice(j,1);
              removed[removed.length] = this.getRecord(lang.isArray(recId) ? recId[0] : recId);
          }
      }
  
      // Update tracker
      this._aSelections = tracker;
  
      // Update UI
      this._unselectAllTrEls();
  
      this.fireEvent("unselectAllRowsEvent", {records: removed});
  }
docs: Clears out all row selections.
  
  @method unselectAllRows