qt-everywhere-src-5.15.1/qtdeclarative/tests/auto/quick/qquickwindow/data/unloadSubWindow.qml

import QtQuick 2.3
import QtQuick.Window 2.2

Window {
    id: root
    property var transientWindow
    property Loader loader1: Loader {
        sourceComponent: Item {
            Loader {
                id: loader2
                sourceComponent : Window {
                    id: inner
                    Component.onCompleted: {
                        root.transientWindow = inner;
                        inner.show();
                    }
                }
            }
            Component.onDestruction: {
                loader2.active = false;
            }
        }
    }
}