filters in admin-interface

[patrick k]

i am trying to display a filter for a many-to-one relation.
problem is: the filter doesn´t show up.

fragment of the model looks like this:

class Project(meta.Model):
   id = meta.AutoField('ID', primary_key=True)
   title = meta.CharField("Title", maxlength=100)
   user = meta.ForeignKey(auth.User)
   createdate = meta.DateField('Date (Create)', auto_now=True)
   updatedate = meta.DateField('Date (Update)', auto_now_add=True)
   class META:
      db_table = "manage_projects"
      ordering = ['-id']
      admin = meta.Admin(
         list_display = ('title', 'id', 'user'),
      )
   def __repr__(self):
           return self.title

class NoteCategory(meta.Model):
   id = meta.AutoField('ID', primary_key=True)
   category = meta.CharField("Category", maxlength=50)
   project = meta.ForeignKey(Project)
   user = meta.ForeignKey(auth.User)
   createdate = meta.DateField('Date (Create)', auto_now=True)
   updatedate = meta.DateField('Date (Update)', auto_now_add=True)
   class META:
      verbose_name = "Note Category"
      verbose_name_plural = "Note Categories"
      db_table = "manage_notecategories"
      ordering = ['-id']
      admin = meta.Admin(
         list_filter = ['createdate','updatedate','project'],
         list_display = ('category', 'id', 'project'),
      )
   def __repr__(self):
           return self.category


any ideas?

patrick