code: @Override
  	@SuppressWarnings("unchecked")
  	protected void onInitialize()
  	{
  		super.onInitialize();
  		add(username = newUsernameTextField("username", getModel()));
  		add(signinPanel = newSigninPanel("signinPanel", getModel()));
  		add(repeatPassword = newRepeatPasswordTextField("repeatPassword",
  			(IModel<BaseUsernameSignUpModel>)getModel()));
  	}
docs: {@inheritDoc}