row lock on innodb database table

[Michael Kalinowski]

hi,

i installed mysql v4.1.11 on a windows 2003 server and it's working fine.
but if i want to realize a row lock on an innodb table like that

select * from mytable where myage = '30' for update

the selected rows should be locked against updating and deleting.
but this is not working.
if i try to delete the rows within the mysql query browser the rows will be deleted.

what can i do against that behaviour?

thanks in advance

michael