Scaffolding and controllers in subdirs

[eluser]Unknown[/eluser]
I'm new here so Hello Everyone.

I'm also new in CI and i have problem with scaffolding. If I put controller in default dir (application/controllers) scaffolding working fine:

localhost/my_page/test/scaffolding
localhost/my_page/test/scaffolding/add

But if i put controller in subdir, like this:

localhost/my_page/admin/test/scaffolding <- this working
localhost/my_page/admin/test/scaffolding/add <- this return 404

Thanks for possible help,

CI 1.7.3
PHP 5.3