public function LoginForm()
    {
        $form = CheckoutLoginForm::create($this, 'LoginForm');
        $form->setAttribute("action", $this->Link("LoginForm"));

        $form
            ->Fields()
            ->add(HiddenField::create("BackURL")->setValue($this->Link()));

        $form
            ->Actions()
            ->dataFieldByName('action_dologin')
            ->addExtraClass("btn btn-primary");

        $this->extend("updateLoginForm", $form);

        return $form;
    }