Triggers operations and log_statement = all not working?

Hi!

I'm debugging few triggers I wrote these days, and I can't see the
triggers statements being logged.
Probably I'm doing something wrong.

I just enabled

log_statement = 'all'

In postgresql.conf, but I can see all statements issued by my
application, but the statements in trigger don't show up.
Is there anything else I need to do to see all trigger statements, or my
triggers are just not being called?

Thanks,