WSGI Behaviour Needed some change

Hi Team,
My name is buvanesh. I am trying to develop a simple zope application (login application). I have create one customised login application. When I login or redirect to my login application. I am getting pop from WSGI asking for username and password. But I want it to redirect to my customised login page where i will authenticate the user. Who can I do that like who can I avoid that pop and see my login application. Where i do the same operation as login page authentication done by WSGI.