[Qt-interest] transparent widget can't have parent widget

[cheng long]

I created a transparent QWinWidget and set the a CView as its parent, but
the QWinWidget has an item in the task bar and it can be shown, hidden and
closed regardless of the CView.

Environment: Qt 4.5.2, Visual Studio 2008, Windows 7,
Code:
         QWinWidget* pQWinWidget = new QWinWidget(pWnd); // pWnd is a CView
pointer
         pQWinWidget->setWindowFlags(Qt::FramelessWindowHint);
         pQWinWidget->setAttribute(Qt::WA_TranslucentBackground);

         QHBoxLayout *pQHBoxLayout = new QHBoxLayout(pQWinWidget);
         pQHBoxLayout->setMargin(0);

         QGraphicsScene* scene = new QGraphicsScene();
         QGraphicsView* view = new QGraphicsView(pQWinWidget);
         pQHBoxLayout->addWidget(view);

         view->setScene(scene);
         view->setMinimumWidth(300);
         view->setMinimumHeight(300);
         view->setRenderHints(QPainter::Antialiasing |
QPainter::TextAntialiasing);
         view->setStyleSheet("background: transparent");

         QGraphicsTextItem* text = new QGraphicsTextItem();
         scene->addItem(text);
         text->setPlainText("hello Qt!");

         pQWinWidget->show();

If I comment these two lines below, the QWinWidget will exist as the CView's
child.
         pQWinWidget->setWindowFlags(Qt::FramelessWindowHint);
         pQWinWidget->setAttribute(Qt::WA_TranslucentBackground);

Any suggestions?

Thanks,
Kevin
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