How do I change max password length on server for local User

I have a Windows 2008 R2 server this server is in a domain but I am trying to change the requirement to in the local GPO for max password length I am logged in as the administrator but when I go change the password length it is grayed out, how can I change this?
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ktaczalaConnect With a Mentor Commented:
If it's on a domain, it follows the password rules from the domain, even for the local admin password.
Natty GregIn Theory (IT)Commented:
Domain rules, every time, you will have to do it on the domain server
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