protected function lookForChild($item, $after)
    {
        if (str_contains($after, '.')) {
            $found = [];
            $this->lookInDeep($this->items, $after, $item, $found);
            if (!empty($found)) {
                $this->items[key($found)]->childs = current($found);
                return $item;
            }
        }
        return false;
    }