How to let application look like windows 7 default style?

[Terreox]

Hi
i was wondering how to get all my buttons styled like default win7 buttons or how to get a combobox like default win7 comboboxes?
every button/combobox/etc. that i use in my application looks like win98. a simple grey rectangle with text. yeaaah amazing -.-'
I dont like this stupid design but i dont know how to change it to Vista/Win7 style :(
Can anybody help me?

Greetz

[AlexSudnik]

Full info :

http://doc.qt.nokia.com/4.7/qstyle.html#public-functions

or try :

<myapplication.exe> -style Vista