@Override
 protected List<InputNode<?>> addNodes() {
   bankCombo.name("Bank").items(service.getBanks()).build();
   checkIdInput.name("Check No.").build(ID);
   return Arrays.asList(bankCombo, checkIdInput);
 }
 @Override
 protected void addItem() {
   checkId = checkIdInput.getValue();
   super.addItem();
 }