public function set($name, $value)
 {
     switch ($name) {
         case 'case':
         case 'view':
             $this->_view_case = $value;
             break;
         case 'vo':
             throw new Readonly_Variable_Exception($name);
         case 'content':
             $this->_content = $value;
             break;
         default:
             try {
                 parent::set($name, $value);
             } catch (HTML_No_Such_Element_Attribute_Exception $e) {
                 $this->_attributes->register($name, $value);
             }
     }
 }