protected function isFormWidget($fieldType)
    {
        if ($fieldType === null) {
            return false;
        }

        if (strpos($fieldType, '\\')) {
            return true;
        }

        $widgetClass = $this->widgetManager->resolveFormWidget($fieldType);

        if (!class_exists($widgetClass)) {
            return false;
        }

        if (is_subclass_of($widgetClass, 'Backend\Classes\FormWidgetBase')) {
            return true;
        }

        return false;
    }