data-state collapsed not working properly

data-state collapsed not working properly

This example of a collapsible div doesn't work with mobile/1.0a4.1.min and jquery-1.5.2:

  <div data-role="collapsible" data-state="collapsed">
      <h3>About this app</h3>
      <p>This app rocks!</p>
    </div>

It does work with mobile/1.0a1.min and jquery-1.4.3

Does anyone know the latest files I can use and have it work?  The page opens with it open instead of collapsed.

Thanks in advance.