Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yep it is part of the UI and not a physical toggle/button.

I thought I read several days back about how you can only 'lock' it in landscape mode. Makes no since to me but does anyone else recall reading that?
 
Once again this should has been there since day 1. Hope to see it soon.

And yes I don't have a clue when this is going to happen.

Common :apple:!
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.