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Showing Qml Message Diaglog while closing qml application

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Hello, I want to show a qml message dialog and let user choose “saving some thing” while exit qml application . I try to show the message diaglog at Component.onDestruction or ApplicationWindow.onClosing. With: Component.onDestruction: no message dialog was shown. With: ApplicationWindow.onClosing: the message diaglog show but the application window disappeared Could you please help me ? Thank you!

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