code: function (rpp,silent) {
          if (Paginator.isNumeric(rpp) && +rpp > 0 &&
              +rpp !== this.get('rowsPerPage')) {
              if (this.get('updateOnChange') || silent) {
                  this.set('rowsPerPage',rpp);
              } else {
                  this.fireEvent('changeRequest',
                      this.getState({'rowsPerPage':+rpp}));
              }
          }
      }
docs: Set the number of rows per page.
  @method setRowsPerPage
  @param rpp {number} the new number of rows per page
  @param silent {boolean} whether to forcibly avoid firing the
  changeRequest event