public function registerSubRoutes(array $classes)
    {
        foreach ($classes as $key => $class) {
            if (is_array($class)) {
                if ($this->usableClass($key)) {
                    $this->registerAdminRoutes($key);
                }

                $this->registerSubRoutes($class);
                continue;
            }
            $this->registerAdminRoutes($class);
        }
    }