Adding an Item to QGraphicsItemGroup Makes It Invisible
The code below

    QGraphicsEllipseItem *ellipse = addEllipse(x, y, 6, 6, series_pen);
    ellipse->translate(-ellipse->boundingRect().width() / 2,
		               -ellipse->boundingRect().height() / 2);
    ellipse->setToolTip(label);

draws the `QGraphicsEllipseItem` on a `QGraphicsScene`. However, the following code doesn't:

    QGraphicsEllipseItem *ellipse = addEllipse(x, y, 6, 6, series_pen);
    ellipse->translate(-ellipse->boundingRect().width() / 2,
		               -ellipse->boundingRect().height() / 2);
    ellipse->setToolTip(label);

    QGraphicsItemGroup *g = new QGraphicsItemGroup;
    g->addToGroup(ellipse);

What is wrong if I add a `QGraphicsItem` in `QGraphicsItemGroup`?

I'm using Qt Creator 2.2.1, Qt 4.7.4 (32 bit) on Windows 7.
Adding an Item to QGraphicsItemGroup Makes It Invisible
===

The code below

    QGraphicsEllipseItem *ellipse = addEllipse(x, y, 6, 6, series_pen);
    ellipse->translate(-ellipse->boundingRect().width() / 2,
		               -ellipse->boundingRect().height() / 2);
    ellipse->setToolTip(label);

draws the `QGraphicsEllipseItem` on a `QGraphicsScene`. However, the following code doesn't:

    QGraphicsEllipseItem *ellipse = addEllipse(x, y, 6, 6, series_pen);
    ellipse->translate(-ellipse->boundingRect().width() / 2,
		               -ellipse->boundingRect().height() / 2);
    ellipse->setToolTip(label);

    QGraphicsItemGroup *g = new QGraphicsItemGroup;
    g->addToGroup(ellipse);

What is wrong if I add a `QGraphicsItem` in `QGraphicsItemGroup`?

I'm using Qt Creator 2.2.1, Qt 4.7.4 (32 bit) on Windows 7.