jQuery UI layout on a container div instead of body

I'm using jQuery UI layout. I want to apply the layout to a container, not the entire body.

Works when I do $('body').layout();.

http://jsfiddle.net/JPEaa/216/

Fails when I add a container div and do $('.myDiv').layout();.

http://jsfiddle.net/JPEaa/217/

Am I selecting or applying my container incorrectly?