name.setRequired(true);
LengthRangeValidator nameLengthValidator = new LengthRangeValidator();
nameLengthValidator.setMin(3);
nameLengthValidator.setMax(100);
name.setValidators(nameLengthValidator);
name.addKeyUpHandler(new KeyUpHandler() {
public void onKeyUp(KeyUpEvent event) {
if ("Enter".equals(event.getKeyName())) {
createNewGroup(modalWindow, form);
}
}