wp_list_pages and sub sub pages

Hello,

I’m looking for a function that will list subpage navigation on a sub-subpage. I’ve set up the code from http://codex.wordpress.org/Template_Tags/wp_list_pages#List_Sub-Pages_.28Wordpress_2.0.1_or_newer.29 to display the nav and the subpages, but it doesn’t extend to sub-subpages.

Can anyone offer any advice?

Thanks.