QT bug? Or win 7?

I have a widget with these flags and attributes:

Code:

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setWindowFlags(Qt::SubWindow | Qt::FramelessWindowHint );
setTransformationAnchor(QGraphicsView::AnchorViewCenter);
 
this->setAttribute(Qt::WA_TranslucentBackground);
this->setAttribute(Qt::WA_TransparentForMouseEvents);

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To make the window always on top:

Code:

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setWindowFlags(Qt::FramelessWindowHint | Qt::SubWindow | Qt::WindowStaysOnTopHint);

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So when the app runs, the window is on top of every other window, but as soon as I click any other window it goes behind the windowI clicked.
Why this behaviour?

Why did you use Qt::SubWindow? What happens if you omit it?

I use Qt::SubWindow so the widget wont have a icon on the taskbar. The widget is a child of another widget.

Let me guess... if you leave this flag out, the window behaves as expected, right?

No everything continues the same.

So you want the window on top of the Z-order regardless of clicking any other window ?

Does your widget inherit QDialog?

Quote:

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So you want the window on top of the Z-order regardless of clicking any other window ?

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Yes. That should work using Qt::WindowStaysOnTopHint. And normally it does.

Quote:

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Does your widget inherit QDialog?

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No. It's a QWidget.

I created this app in windows Vista 32bit and never had this trouble. Only after compiling in Windows 7 64bit that this ocurred.

More explanation:
My app has a checkbox to enable/disable Qt::WindowStaysOnTopHint. The first time Qt::WindowStaysOnTopHint is set via setWindowFlags(), if I click any other window, it suddenly goes behind it(almost as if Qt::WindowStaysOnTopHint was removed). But then if I check the control checkbox(triggers a slot that -> setWindowFlags(Qt::WindowStaysOnTopHint)) the widget behaves as expected staying on top of any window.