QT Application in Plastique style

I want to create an application that looks "Plastique" ( i think it's de visual style on mac or something like that ) . But i want it to look Plastique even on windows or linux .
In QT Designer i discovered an option "Form Preview In" , where i can choose from different styles for the widgets . How can I do the same thing with my application ?

you can set style using

Code:

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...
QApplication::setStyle(new QPlastiqueStyle);
...

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By the way, Plastique is the "native" Qt style on Linux, as long as the application doesn't adopt the style of the desktop it is running in.