onClosingNameTest.qml

import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Window 2.2

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 300


    Window {
        id: childWindow
        width: 200
        height: 200
        visible: true

        Component.onCompleted: {
            console.log("Check type of variable 'close' in Window scope", close)
        }

        onClosing: {
            console.log("Window about to close …");
            console.log("Check type of variable 'close' in onClosing scope", close)
            console.log("Get accepted status:", close.accepted)
            console.log("Set accepted status …")
            close.accepted = false
            console.log("Get accepted status:", close.accepted)
        }
    }
}