public function getMetaData($model = null)
 {
     $ret = parent::getMetaData($this->getModel());
     /*
     TODO: implement hideForValue in Ext forms, then this below is needed
     $ret['hideForValue'] = array();
     foreach ($this->_hideForValue as $v) {
         $ret['hideForValue'][] = array(
             'field' => $v['field']->getFieldName(),
             'value' => $v['value'],
             'hide' => $v['hide']->getFieldName(),
         );
     }
     */
     return $ret;
 }