form.getField("id").setRequired(true);
form.getField("id").setRequiredError(i18nManager.getMessage(Messages.GROUP_ID_REQUIRED));
form.getField("id").focus();
// Set id field to be unique
form.getField("id").addValidator(new Validator() {
public void validate(Object value) throws InvalidValueException {
if (!isValid(value)) {
throw new InvalidValueException(i18nManager.getMessage(Messages.GROUP_ID_UNIQUE));
}
}