quixote 2.4 and _q_access

hi.

i can't get _q_access to work. when i understand this right, all i have 
to do is derive my root-directory from Directory and AccessControlled 
and then define _q_access in my root-directory.

i did this, but _q_access isn't called.

the root directory has Directory's instances as attributes and publishes 
them.

i'm using simple_server and took the http-auth example from wiki to 
implement _q_access

any hints?

regards,

alexander