Crap, I'm at home. I don't have it here, but it's a new style that comes with 4x where it wasn't in 3.3, and it begins with C but is not CDE. I kind of has a XP look.

I am running on redhat 9.0.

In response to jpn, I'm using QPushButton and setting it to checkable to get a toggle button. But upgrading to 4.2.2 may fix the problem.