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Qt Stylesheet mystery
this->ApplyStyleSheet(":/qss/default.qss");

QWidget#myWidget {
    background: transparent;
    background-image: url(:/images/bg_img.png);
    background-repeat: repeat-x;
}

QMyDerivedClass#myWidget {
    background: transparent;
    background-image: url(:/images/bg_img.png);
    background-repeat: repeat-x;
}

void CustomWidget::paintEvent (QPaintEvent *)
{
    QStyleOption opt;
    opt.init (this);
    QPainter p (this);
    style ()->drawPrimitive (QStyle::PE_Widget, &opt, &p, this);
}