// builder.add("birthday");
builder.row();
ConfigurableFormModel formModel = getFormModel();
ValueModel derivedValueModel = new MessageFormatValueModel("{0} {1} was born on {2}", new ValueModel[] {
getValueModel("name"), getValueModel("surname"), getValueModel("birthday") });
FieldMetadata fieldMetaData = new ReadOnlyFieldMetadata(getFormModel(), String.class);
formModel.add("derivedBirthday", derivedValueModel, fieldMetaData);
builder.add("derivedBirthday");
return builder.getForm();
}