Can't access items by id in Debugger Console that are not top level

import QtQuick 2.5
import QtQuick.Window 2.2

Window {
    id: window
    visible: true
    width: 640
    height: 480

    Text {
        id: message
        anchors.fill: parent
        text: "hello"
    }
}

message.text = "world"

ReferenceError: message is not defined