public function findTab($tabName)
    {
        $parts = explode('.', $tabName);
        $last_idx = count($parts) - 1;

        $currentPointer = $this;

        foreach ($parts as $k => $part) {
            $parentPointer = $currentPointer;
            /** @var FormField $currentPointer */
            $currentPointer = $currentPointer->fieldByName($part);
        }

        return $currentPointer;
    }