Customize PUC by specific user

Hi all,
i would like to customize PUC taking care of the user who login into the system.
For example, I would like that an admin user could see all menu buttons and, instead, an authenticated user or another one could see only some menu-buttons.

I read about the possibility of changing PUC-UI, but i didn't find any documentation for my issue, e.g. change the UI basing on the user role.

Any suggest will be appreciated.

Yamas,
Marco