/**
  * Retrieve the default javascript behavior manager.
  *
  * @param mixed $context
  * @return void
  */
 public static function getManager($context = null)
 {
     if (is_null(self::$manager)) {
         if (is_null($context)) {
             $context = sfContext::getInstance();
         }
         self::checkConfiguration($context);
         $managerClass = sfConfig::get('app_sfDynamicsPlugin_manager', 'sfDynamicsManager');
         self::$manager = new $managerClass($context);
     }
     return self::$manager;
 }