public function getCMSFields()
 {
     $fields = parent::getCMSFields();
     $fields->addFieldsToTab("Root.Config", array(DropdownField::create('StaffCategoryID')->setTitle('Staff Category')->setEmptyString('Please Select')->setSource(StaffCategory::get()->sort('Title ASC')->map('ID', 'Title'))));
     return $fields;
 }