Joomla Registered Article does not call cblogin

i am running community builder successfully on my site. i have selected to display both the registration form and the login screen.

i notice that when i choose to have content to be registered access only, joomla calls the normal URL index.php?option=com_user and not the cb page?

how do i tell joomla to always use community builder?

Thanks

if you are on joomla 1.5 there is a redirect plugin on the JED that can be used
extensions.joomla.org/extensions/access-a-security/authentication/1236

bye