grep bug ?

[Alien]

well, I'm ot sure if this is a bug ...
but it's something that's bugging me, and I'm sure it bugs other
shell scripters.
grep {foo,bar} file
that works fine, it greps all lines containing foo and bar
but when doing:
grep -v {foo,bar} file
it doesnt work at all ...
Any other syntax for that operation, is it bug or just not possible
with grep ?
(if the later .... please do impliment it)

Thanks.

Billy Wideling.