QuickForm controller custome Next action

Hi, I wrote a custom action for a next button. It extends from Action_Next and checks for a certain condition. If this condition is true it then jumps to a given page. I start on page one and click next (my custom conditionnal next) it goes on to page 2 (instead of page 3). If i click previous i go back on page one. Then i press next an it jumps to page 3. I added some var_dump and i see that the first time next has the right value (page3). Any idea what might be causing this ? Here is the incriminated action if it helps. class ActionConditionalNext extends HTML_QuickForm_Action_Next {

    function perform(&$page, $actionName)
    {
        // save the form values and validation status to the session
        $page->isFormBuilt() or $page->buildForm();
        $pageName =  $page->getAttribute('name');
        $data     =& $page->controller->container();
        $data['values'][$pageName] = $page->exportValues();
        $data['valid'][$pageName]  = $page->validate();

        // Modal form and page is invalid: don't go further
        if ($page->controller->isModal() && !$data['valid'][$pageName]) {
            return $page->handle('display');
        }
        $nextName = $page->controller->getNextName($pageName);

        switch ($data['values'][$pageName]['field']) {
            case 'test':
                $nextName = 'page3';
                break;
        }
        $next =& $page->controller->getPage($nextName);
        $next->handle('jump');
    }

} Arnaud.