Tooltips possible with QGraphicsProxyWidget?

[cass]

Is it possible to use tooltips on widgets that is place in a QScene with QGraphicsProxyWidget?

The following is a simplified version of what I am trying to do:

QListWidget* list = new QListWidget();
list->setToolTip("This is my tooltip");
QGraphicsScene* scene = new QGraphicsScene();
scene->addWidget(list);

QListWidget* list = new QListWidget();
list->setToolTip("This is my tooltip");
QGraphicsScene* scene = new QGraphicsScene();
scene->addWidget(list);

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I can see my listbox and I can click and select items, etc. But the tooltip is never displayed.