QGraphicsScene brush not working

[gib]

I've given up on trying to paint a QMdiArea, and instead I'm using the code below to paint on a scene -> view -> layout -> groupBox. Strangely, although I get a black rectangle, from the pen, the brush has no effect - I can't fill the rect.

EDIT: I found the answer:
brush.setStyle(Qt::SolidPattern);

QVBoxLayout *layout = new QVBoxLayout();
    groupBox_test->setLayout(layout);
    QBrush brush;
    QPen pen;
    brush.setColor(Qt::red);
    pen.setColor(Qt::black);
    QGraphicsScene *scene = new QGraphicsScene();
    QGraphicsView *aview = new QGraphicsView(scene);
    layout->addWidget(aview);
    scene->addRect(0,0,50,50,pen,brush);
    aview->show();

QVBoxLayout *layout = new QVBoxLayout();
    groupBox_test->setLayout(layout);
    QBrush brush;
    QPen pen;
    brush.setColor(Qt::red);
    pen.setColor(Qt::black);
    QGraphicsScene *scene = new QGraphicsScene();
    QGraphicsView *aview = new QGraphicsView(scene);
    layout->addWidget(aview);
    scene->addRect(0,0,50,50,pen,brush);
    aview->show();

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[d_stranz]

Oh yes, there's a third way to paint onscreen without a paint event, and that's to use the graphics / view architecture. In this case, the QGraphicsView::paintEvent() is doing the work of converting the scene graph into pixels.