Find a way to populate ColabSearchForm

[chaws]

in colab/search/forms.py there's the following content:
list = forms.MultipleChoiceField(
required=False,
label=_(u'Mailinglist'),
choices=[('TODO', 'TODO')]

choices=[(v, v) for v in MailingList.objects.values_list(

'name', flat=True)]

)
Let's try to find a way to do it using plugin instead