[fw-mvc] Find + adPages method seems to remove pages from container on Zend_navigation

Hi,

I have a navigation container, having a custom properly set to 1 for some of them and for rest not been set.

I am trying to render two menus based on the container. First menu would have all the pages containing that custom property, and the second one all the root pages, no matter if tagged with that custom property,

//first menu
$topMenuContainer = new Zend_Navigation();
$topMenuContainer->addPages( $this->navigation()->findBy('top', '1', true) );

echo $this->navigation()->menu()->renderMenu($topMenuContainer, array('maxDepth'=>0));

//secondmenu

echo $this->navigation()->menu()->renderMenu(null, array('maxDepth'=>0));

The first menu is rendered properly, but the second menu has only the elements not tagged with 'top' property.

Is this normal behavior or is a bug ?

Cristian