How to change a created application form with a "clean looks" style or other styles?

Hello,
I am trying to set a "clean looks" style to my created application form or dialog. How can I do it?
:confused:

You cannot do it in Qt Designer. Use QWidget::setStyle() in code.

You can even set the style when starting the application. See http://doc.trolltech.com/4.4/qstyle.html#details -> Setting a Style.
That's nice :).

Thank you!
It was not that difficult as I thought first :o.

How I did it:

app = QtGui.QApplication(sys.argv)
#QCleanlooksStyle
app.setStyle('cleanlooks')

And that makes the trick that I was looking for.