[web2py] reference of table in auth user with drob down menu

[BlueShadow]

Hi I like to extend my auth_user tables to include the country and the sex 
of the user.
if I do so byauth.settings.extra_fields['auth_user']= [ 
Field('country', 'reference country'),
 Field('sex', 'reference sex')
]
I dont get a drob down menu like when I do it with normal db tables when I 
try to add requires=IS_IN_DB(db,'db.country') I get an error message for 
the db
Anyone knows what I did wrong?