How to customize main form ID in Symfony2
===

I have problems with setting form wrapper custom ID. $options['attr']['id'] dont seem to work. All options passed to createForm() method seems to be ignored...
I'm working on Symfony 2.1 beta 1

Form setup:

    $login_form = $this->createForm(new LoginType(), $user, array(
						'attr' => array(
							'id' => 'login-form'		
						)
					));

which is passed to the view:

    {{ form_widget(login_form) }}

But it produces:

    <div id="login">
        <div>
            <label class="required">Mobile</label>
            <input type="text" maxlength="255" required="required" name="login[mobile]" id="login_mobile">
        </div>
        <div>
            <label class="required">Password</label>
            <input type="text" maxlength="255" required="required" name="login[password]" id="login_password">
        </div>
    </div>

So the form wrapper have id="login", instead of "login-form"