public function getCMSFields()
    {
        $this->beforeUpdateCMSFields(function ($fields) {
            $fields->addFieldToTab('Root.Images', new UploadField('PreviewImage', 'Page Preview Image'));
            $fields->addFieldToTab('Root.Banner', TextField::create('BannerLeadIn', 'Banner Text'));
            $fields->addFieldToTab('Root.Banner', new UploadField('BannerImage', 'Page Banner'));
        });

        $fields = parent::getCMSFields();

        return $fields;
    }