odering User in a form

Hi,

I've this model:

class Pubblicazioni(models.Model):
anno = models.DateField(blank=True, null=True,default=datetime.date.today)
autori = models.CharField(max_length=500)
titolo = models.CharField(max_length=500)
autori_daf = models.ManyToManyField(User)

I need to ordering (by the User.last_name) the field 'autori_daf'
when it is displayed at the form generated by

class PubblicazioniForm(ModelForm):
class Meta:
model = Pubblicazioni

Thanks,

Alfredo

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