[Rails] "About your application’s environment" not collapses

I'm new to Ruby and Rails too. I've installed Rails 3.0.9 and all seems
to be working fine. I've created a new app and started the server. The
page "Welcome aboard" shows fine. When clicked the link "About your
application's environment", a box expands with the app environment info.
But, when clicked this link again, this box don't collapses. I think
that this is an error. My expected result is that this box collapses
after a second click.

I don't see any errors in the rails log folder neither the javascript
console.

The same result occurs with Rails 3.0.7. With Rails 2.3.7, the box
collapses fine.

More environment's info: Linux Gentoo & Ruby 1.9.2p180.

I cannot figure out how to debug this little problem (I'm not even sure
if my expectation is correct).

Please, I need some hints about this situation. Tell me if you need more
info.

Thanks for read this.
José María Michia

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