public function add($name, $type = null, array $options = array(), array $fieldDescriptionOptions = array())
    {
        if (null === $this->formMapper) {
            throw new LogicException('No FormMapper to add fields to, please make sure you start with AdminUtil->map');
        }
        $this->formMapper->add($name, $type, $options, $fieldDescriptionOptions);
        if ($this->addHelp) {
            $this->formMapper->setHelps([$name => 'help' . (null !== $this->helpPrefix ? sprintf('.%s', $this->helpPrefix) : '') . '.' . $name]);
        }
        return $this;
    }