i can't see Qwebview and Qtreewidget in widget box of design panel in Qt creator

Hi,
i am new in qt.
i want to write a program that get a web page and extract its tree, just like example project "domtraversal" in
http://doc.qt.nokia.com/latest/webkit-domtraversal.html

i'm trying to insert qwebview and qtreewidget in my ui, but these widgets are not in both widget box of QT creator an QT designer. (i can't find them)
how can i use these items?

i'm using Qt creator 2.0.1 (based on QT4.7.0) in ubuntu 10.04.


thanx :)

can you send a screen shot of your widget box. Because they should be there. The QWebView is the last one normally.

here is 2 screen shots.
there is no result when i search for these items in search box.

and the tree widget is not at the "item widgets" section? (the webview is really not there. I'll check that later on my linux box.)

yes, after i searched more i found treewidget item which is a Qtreewidget object.
but i have no idea about Qwebview, yet.

i appreciate you,