QStyleOptionProgressBarV2 adding stylesheet , how can it be done ?

[umen242]

I have ListWidgetItem Deleget , in the paint method i drow progress bar like this :

@ QStyleOptionProgressBarV2 optionProgress;

        optionProgress.rect = ProgressBarRec;
        optionProgress.maximum = 100;
        optionProgress.minimum = 0;
        optionProgress.progress = 0;
        optionProgress.textVisible = false;
        optionProgress.orientation = Qt::Horizontal;
        QApplication::style()->drawControl(QStyle::CE_ProgressBar, &optionProgress, painter, 0);   

@

all working great and i see the progressBar , but now i want to style it , and i can't find any way to do it ,
how do i style QStyleOptionProgressBarV2
with this :

@ QProgressBar:horizontal {
border: 1px solid gray;
border-radius: 3px;
background: white;
padding: 1px;
}
QProgressBar::chunk:horizontal {
background: qlineargradient(x1: 0, y1: 0.5, x2: 1, y2: 0.5, stop: 0 green, stop: 1 white);
}
@