Change layout of QWizard under OS X

I'm just starting with Qt, but this doesn't feel like a "Newbie" issue.

The default style of a wizard looks something like this:

http://i.stack.imgur.com/Y7YUp.png

I hate that empty space on the left of the actual content, its completely wasted. I much prefer what the Dropbox guys have done (at least thats where I saw it):

http://i.stack.imgur.com/FgzhL.png

Is this possible using QWizard or do I have to implement my own wizard class? Is QStackedWidget the best tool for the job? Can I use QWizardPage[s] with my own wizard class?