Overriding 3th party app (http://djangosnippets.org/snippets/1035/)

admin.py

from django.contrib import admin
from django.contrib.flatpages.models import FlatPage

# Override flatpage admin
class FlatPageAdmin(admin.ModelAdmin):
    class Media:
        js = ('/media/j/jquery.js', 
              '/media/j/admin_enhancements.js')
        css = {'screen': ('/media/c/admin.css',)}
    
admin.site.unregister(FlatPage)
admin.site.register(FlatPage, FlatPageAdmin)

urls.py

from django.contrib import admin
admin.autodiscover()

# import has to come after autodiscover, because we can't 
# unregister FlatPage until it's already been registered.

import generic.admin