public function updateCMSFields(FieldList $fields)
 {
     $service = ServiceDefinition::get();
     if ($service->Count() > 0) {
         $fields->insertAfter($serviceOptions = new DropdownField('ServiceID', 'Service', $service->map('ID', 'Title')), 'Title');
         $serviceOptions->setEmptyString(' ');
     } else {
         $fields->removeByName('ServiceID');
     }
     $type = TypeDefinition::get();
     if ($type->Count() > 0) {
         $fields->insertAfter($typeOptions = new DropdownField('TypeID', 'Type', $type->map('ID', 'Title')), 'Title');
         $typeOptions->setEmptyString(' ');
     } else {
         $fields->removeByName('TypeID');
     }
 }
 public function ServiceDefinitions()
 {
     return ServiceDefinition::get();
 }