public function __construct($src = null)
 {
     $attributes = array();
     if ($src) {
         $attributes['src'] = $src;
     }
     return parent::__construct('img', $attributes);
 }
 protected function addWidget(Lms_View_Widget_Abstract $widget)
 {
     if ($widget instanceof Lms_View_Widget_NullWrapper) {
         foreach ($widget->getNode()->childNodes as $node) {
             $this->_node->appendChild($node);
         }
     } else {
         $this->_node->appendChild($widget->getNode());
     }
 }