Zend面包屑renderPartial

Following up this question, I posted a while back, I'm trying to create a custom breadcrumb render.

For some reasons I can't get access to the container!

In my controller:

$config = new Zend_Config($menu);
$nav = new Zend_Navigation($config);
$this->view->nav = $nav;

$page = $this->view->nav->findOneBy('id', $id);
if ($page)
{
    $page->setActive();
}

In my view:

<?php echo $this->navigation()->breadcrumbs()->renderPartial($this->nav, 'breadcrumbs.phtml'); ?>

In my breadcrumbs.phtml

<?php
foreach($this->container as $page)
{
    echo $page->label;
}
?>

I get:

WARNING: INVALID ARGUMENT SUPPLIED FOR FOREACH() IN