Enforce login

I want to make a Silverlight application, so I started using the "DevForce Silverlight Business Application". I noticed that when I launch this application, it takes me to these Home and About pages, with a login link.

In my application, I want to force people to log in, no matter which "page" in my Silverlight they are visiting. I have my own ideas on how to accomplish this, but they all seem like more work than should be strictly necessary (e.g. checking the authentication status on every page and redirecting to a login page if the check fails -- even more work because SL is async.)

What is the best way to accomplish this? Is there a setting I can turn on? Your http://drc.ideablade.com/xwiki/bin/view/Documentation/authorize documentation only speak about how to authorize for the model, not how to authorize for the view.