Help with Taxonomy parents on drupal 6.13

Hello,

I am trying to create View that will list all the Taxonomy by theirs parent term.

I create Taxonomy:Parent term,and child term.

If I have structure of the vocabulary:
Term1
-- Subterm1
-- Subterm2
Term2
-- Subterm3

When I pass to the view argument Term1 I expect to have result: Subterm1, Subterm2, and Term1 BUT I get: Term1 and that is it.

Could you please point me where I am wrong?

Thank you in advance.