How to make hottracking for QPushButton?

Hi all

I make a QPushButton flat. So user expect that button shape will appear when he move mouse arrow over the button. If my memory serves me right this is called hottracking. Currently button appear only when user click it - but this is not enought because user must have hint that there is some thing clickable below mouse arrow.
So: how to enable QPushButton hottracking?

thanks

Use QToolButton with autoRaise property set to true instead of the push button.