QRubberBand make background invisible

[FlameFurious]

painter.setBrush(QBrush(QColor(0, 0, 0, 255)));

painter.setBrush(QBrush(QColor(0, 0, 0, 255)));

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That makes it black instead of white.

CustomRubberBand *selection = new CustomRubberBand(QRubberBand::Rectangle, 0);
selection->setGeometry(150,150,250,250);
selection->show();

CustomRubberBand *selection = new CustomRubberBand(QRubberBand::Rectangle, 0);
selection->setGeometry(150,150,250,250);
selection->show();

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There is no effect with "selection->setWindowOpacity(0.0);" at all.