Removing pressed effect from a QPushButton

Hi! I subclassed QPushButton to create buttons which have the pressed effect by changing the icon. Seems to work ok, but I noticed that QPushButton creates a pressed effect on its own by slightly moving the icon. Is it possible to remove this effect?
Thanks!

Probably using styles or stylesheets

I tried to search in the reference, but I'm finding it difficult as I don't know how to call that effect. Any idea?
Thanks!

Try this:

Create a stylesheet for a QPushButton, normal and pressed conditions.
In it, add an image. Check if it moves it around when pressing the button. If so, try to use image-position to position the image.
http://doc.qt.nokia.com/4.6/stylesheet-reference.html