QLabel isnt transparent when rendered on item delegate (QStyledItemDelegate)

[umen242]

i have strange problem i have item delegate inherit from QStyledItemDelegate
the background color is gradient color that looks like this :
@void ItemDelegate::paintActiveOverlay( QPainter *painter, qreal x, qreal y, qreal w, qreal h ) const {

QPalette palette;
QColor highlightColor = palette.color(QPalette::Highlight);
QColor backgroundColor = palette.color(QPalette::Base);
const float animation = 0.25;
const int gradientRange = 16;

QColor color2 = QColor::fromHsv(
        highlightColor.hue(),
        (int) (backgroundColor.saturation() * (1.0f - animation) + highlightColor.saturation() * animation),
        (int) (backgroundColor.value() * (1.0f - animation) + highlightColor.value() * animation)
        );
QColor color1 = QColor::fromHsv(
        color2.hue(),
        qMax(color2.saturation() - gradientRange, 0),
        qMin(color2.value() + gradientRange, 255)
        );
QRect rect((int) x, (int) y, (int) w, (int) h);
painter->save();
painter->setPen(Qt::NoPen);
QLinearGradient linearGradient(0, 0, 0, rect.height());
linearGradient.setColorAt(0.0, color1);
linearGradient.setColorAt(1.0, color2);
painter->setBrush(linearGradient);
painter->drawRect(rect);
painter->restore();

}

@

its called from the paint method
also in the ItemDelegate constructor i have set QLable like this :

@QRect rect(40, 30, 401, 31);
Qt::TextInteractionFlags flags = Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse;
Qt::TextFormat txtFormat = Qt::PlainText;

pTextEdit_title = new QLabel();
pTextEdit_title->setTextFormat(txtFormat);
pTextEdit_title->setTextInteractionFlags(flags);
pTextEdit_title->setGeometry(rect);@

and in the paint method of the ItemDelegate i set the Qlable to render like this :
@pTextEdit_title->setText(Title);
QRect TextEditRect(option.rect.x()+THUMB_WIDTH+THUMB_WIDTH+PADDING, option.rect.y() ,
pTextEdit_title->width(), pTextEdit_title->height());
QPixmap pixmap(pTextEdit_title->size());
pTextEdit_title->render(&pixmap);
painter->drawPixmap(TextEditRect,pixmap);
@

it render the QLable file , but the problem is that it has gray background and dosnt act as transparent background , my question is how to set the QLable background to be transparent?