code: function (e) {
          if (e && e.prevValue === e.newValue) {
              return;
          }
  
          var rpp     = this.paginator.get('rowsPerPage')+'',
              options = this.select.options,
              i,len;
  
          for (i = 0, len = options.length; i < len; ++i) {
              if (options[i].value === rpp) {
                  options[i].selected = true;
                  break;
              }
          }
      }
docs: Select the appropriate option if changed.
  @method update
  @param e {CustomEvent} The calling change event