[Samba] How Can I Stop Certain Passwords from Expiring?

[lists at trcintl.com]

I recently started using pdbedit to set the maximum password age policy on v3.0.25a.   How can I
set certain passwords so they don't expire?  I have been trying the folowing command but I can't see
that it is doing anything:

pdbedit -cX -u root

It returns the stats for the root user, but the password appears to still be set to expire? 
How can I accomplish this and how can I verify that it worked?


Thank you in advance.