@Override
  public void reloadAttribute(VBox box) {
    int txNumber = jvstm.Transaction.current().getNumber();

    List<VersionedValue> vvalues = getMostRecentVersions(box, txNumber);
    box.mergeVersions(vvalues);
  }
 private String makeKeyFor(VBox vbox) {
   return vbox.getId();
 }