public function configureShowFields(ShowMapper $filter)
{
$filter->with('customer.group.general')->add('user', 'sonata_type_model_list')->add('firstname')->add('lastname')->add('locale', 'locale')->add('birthDate')->add('birthPlace')->end()->with('customer.group.contact')->add('email', 'email')->add('phoneNumber')->add('mobileNumber')->add('faxNumber')->add('isFake')->end();
}