QWidget inside QGroupbox semi transparent [Qt 4.3.1]

[desch]

the setWindowOpacity is used for top-level Widget; the aim is to get a standalone widget able to take an opacity different at 0.5 and able to transmit this transparency to all any child widget inside....I attached the picture

this was obtained with this code to the subclass of QGroupBox

void CMyGroupBox::paintEvent(QPaintEvent *)
{
    QStylePainter paint(this);
    QStyleOptionGroupBox option;
    initStyleOption(&option);
	paint.setOpacity(0.25);
    paint.drawComplexControl(QStyle::CC_GroupBox, option);
}

void CMyGroupBox::paintEvent(QPaintEvent *)
{
    QStylePainter paint(this);
    QStyleOptionGroupBox option;
    initStyleOption(&option);
	paint.setOpacity(0.25);
    paint.drawComplexControl(QStyle::CC_GroupBox, option);
}

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