How do you break out of the ThemeForest demo frame into your own site?

I know there are a few ways to do this, but I’m just curious if you’re one of the authors doing this, how are you doing it? I’m talking about when you view the live demo of a theme and instead of loading in the standard ThemeForest frame with the black header at the top, it redirects to your site with your own custom theme switcher at the top.

Is this custom coded, a WordPress plugin, a mix of both…? And does it require you to install all of your themes in the same installation of WordPress? (i.e. would it work if each of your live demos sits on its own WordPress install…)

I appreciate any pointers, but I understand if you’re hesitant to help out a fellow author who is also a potential competitor.

Thanks!

I.T.

Most use this http://themeforest.net/forums/thread/introducing-item-switcher/42612

You can see a demo on one of my items, i heavily modified/improved it.

Appreciate it guys, thanks a lot!