foreign key search in admin

hi all... i'm banging my head against a wall here.

consider this model

class mymodel(models.Model):
id = models.AutoField (primary_key=True)
Barcode = models.IntegerField(unique = True, blank=False)
CustomerId= models.ForeignKey(Customer, db_index=True,
blank=True, null = True)

Now in the admin list view, we are able to pull back
Customer.FirstName and Customer.Lastname in the list fields.

How would i search mymodel from admin on Customer.FirstName or
Customer.LastName?

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