protected function defaultData()
    {
        parent::defaultData();
        if($this->hasRequestParameter('uri')){
            $uri = $this->getRequestParameter('uri');
            $classUri = $this->getRequestParameter('classUri');
            if(!empty($uri)){
                $item = $this->getResource(tao_helpers_Uri::decode($uri));
                $this->setData('label', $item->getLabel());
                $this->setData('authoringUrl', _url('authoring', 'Items', 'taoItems', array('uri' => $uri, 'classUri' => $classUri)));
                $this->setData('previewUrl', $this->getClassService()->getPreviewUrl($item));
            }
        }
    }