[CentOS] QT menu decorations missing on Centos 6

See this screenshot for an example of what I get when I run qtconfig-qt4 on Centos 6 and select a menu:

http://www.melvilletheatre.com/screenshot-qt-example.png

If the list is long, the menu extends from the top to the bottom of my physical screen, with a little arrow at the top and the bottom which, if I sit the mouse pointer on the arrow, makes the list scroll up and down.

As you can see, the decorations (scroll bar, etc) are missing. I don't think it's a configuration issue, but rather an issue of a missing library, or missing functionality in a library. The program appears to be trying to use a qt function that doesn't exist on this computer so it's doing some kind of a fallback to a bare-bones menu list.