reverse urls on admin

[Marc Aymerich]

Hi,
I've overrided the get_urls() of one of my ModelAdmin in order to
provide some extra views. what I did is:

def get_urls(self):
"""Returns the additional urls used by the Contact admin."""
....
select_urls = patterns("",
url("^contract_pack/(?P<contact_id>\d+)/",
include(ContractPackAdmin(Pack, admin_site).get_urls()),
name="contract_pack"),)
return select_urls + urls

so now I'm trying to get the reverse url with reverse() but I've
failed on every try I did. I've tried with:

reverse('admin:"app_label"_"app_module"_contract_pack',
kwargs={'contact_id': 1})
reverse('admin:contract_pack', kwargs={'contact_id': 1})
reverse('contract_pack', kwargs={'contact_id': 1})

What acutally is the correct string for getting this url via reverse()?

Thanks!!!
--
Marc