window icon in QGraphicsProxyWidget

[Maike.F]

Hello,
is there a way to set the window icon for a QGraphicsProxyWidget?

I've tried to set it via

widget()->setWindowIcon(QIcon(...));

widget()->setWindowIcon(QIcon(...));

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and also by

QApplication::setWindowIcon(QIcon(...));

QApplication::setWindowIcon(QIcon(...));

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..but still the Qt-Icon shows, which is neat, but I want to show my own icon.

any ideas?

Thanks in advance!