[fw-general] Zend_Form displayGroup render problem

[rpsimao]

In Controller: 
class IndexController extends Zend_Controller_Action
{

    public function init()
    {
        $this->form = new RPS_Forms_Build_Ocorrencias();
    }

    public function indexAction()
    {
        //Zend Form Elements
        $values = $this->form->buildForm();
        $form = new Zend_Form();
        $form->setAction('/process');
        $form->addElements($values);
        $form->addDisplayGroup(array('origem'), 'left');
        $form->addDisplayGroup(array('sistema'), 'left1');
        
        
        $this->view->form = $form;
        
    }
}

In View:
<div id="esq">
<?=$this->form->left;?>
</div>
<div id="nav">
<?=$this->form->left1;?>
</div>

So the problem is:
It only renders the Form elements, it doesn´t render the action, so my form
isn´t really a form, just a couple of inputs.
If I pass the render() method it renders again all the elements.
How can I render the groups?

Please advice
Thanks
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