Problem using sign up code and site wide privacy plug-ins together

I am creating an online community that I would like to be private so I enabled the site wide privacy plug-in and set it to "Only allow logged in users to see all blogs". I then installed the sign-up code plug-in and entered my sign up could. But the sign of code button only ever appears when I disabled the site wide privacy plug-in. Is there a way to accomplish this with these 2 plug-ins or should I be using something different?