[...]
Petasis George observes that "Under Qt, the programmer can control only a few aspects of how the widget looks. The vast majority of the appearance of the widget is determined by the theme." Also surprising, from a Tk programmer's perspective, is that a button can't be simultaneously decorated with an image and a label.
CL collects more Qt references at http://starbase.neosoft.com/~claird/comp.windows.misc/Qt.html .