ManyToMany + through model disappear from Admin interface

Hello,
I have this simple code, which dives me crazy already :(

class ActiveInformer(models.Model):
informer = models.ForeignKey('Informer',
related_name='act_informers')
user = models.ForeignKey(User, related_name='informers')

class Informer(models.Model):
informer_types = (('P', 'Poll'),
('I', 'Info'),
)
Name = models.CharField(max_length=50)
Type = models.CharField(default = 'I', max_length=1", choices =
informer_types)
Active = models.BooleanField(default=False,')
ActiveFor = models.ManyToManyField(User, through=ActiveInformer)

class User(models.Model):
...

The issue is, when I avoid "through=ActiveInformer" parameter, I can
see list of Users on Admin interface (when Django create it's own
table for ManyToMany relation). As soon as I add "throught=", related
Users disappear from list of shown Informer parameters on Admin
interface.
How to overcome this? What I'm doing wrong?

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