No, I’m afraid that is exactly what it means. QGraphicsProxyWidget is a QGraphicsItem and not a QQuickItem. Since QtQuick 2 is not built on top of QGraphicsView like QtQuick 1 was, it is no longer possible to add widgets this way.
One possible solution would be to port QTreeView into a QQuickPaintedItem yourself. The other option you have is to embed QtQuick 2 into a widget application, which will be supported in 5.1.
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