Unable to see layout design in page editor

I am using JDeveloper version 11.1.2.0.0.
I downloaded the hands-on practices from the site Tuhra2 – Sample application for the Oracle JDeveloper 11g Handbook.
When I open the jspx files under Web Content, the visual design does not show up in the Design tab, instead I can only see the tags in text form.
What can I do to see the visual layout of the page?

I'm having same strange behavior.
Before my JDeveloper 11g R2 Design Page work OK. Than I checkout application from SVN to another folder in FS (my JDev was closed meanwhile). I opened JDev and closed "old" app and open "new" (from that different folder) app and my Visual Design Page Editor does not work well (it is rendering well unusual with some kind of structure view).
I have checkouted my app on another computer which has JDev installed in designer works ok. So obviously this is not app-based issue but JDev-vbased issue. What now?
And if I enable Tools -> Preferences -> JSP and HTML Visual Editor -> Show Design Time Messages in Log I'm getting:
WARNING: [ADFbc, ADFc, ADFm, ADF_FACES, TRINIDAD] features were found in ViewController.jpr but are not installed. Install these technologies before you proceed.Edited by: zmeda on Sep 1, 2011 11:55 AM Added WARNING

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