First let me say that I my computer is in a domain.  The DC + my computer
both have strong password policy in effect and an account lockout threashold.

I have SQL 2005 express installed (mixed mode).  I've created a new user and
pointed it to a test DB I have.  Gave the user db_owner rights (since I'm
experimenting here).  On the status section where it says "Status | SQL
Server Authentication" and has the checkbox "Login is locked out" - mine is
grayed out so I can't check or uncheck it.

How or what can I do to get it so I can check/uncheck at will?  I thought
enableing a password lockout threashold on the computer itself and being
passed down from my domain controller would play a part in that..but it's
not.  Any ideas?  

Thanks in advance.