how to hide Role (SOLVED)

How to hide from new users a ROLE sellection upon registration process?
function role__permissions(&$record){
if ( isAdmin() ) return null;
return Dataface_PermissionsTool::NO_ACCESS();
}
function Role__permissions(&$record){
$auth =& Dataface_AuthenticationTool::getInstance();
$user =& $auth->getLoggedInUser();
if ( !isset($user) ) return Dataface_PermissionsTool::NO_ACCESS();
else return null;
}