item layer does not display contents

import QtQuick 2.0

Item {
    width: 800
    height: 400

    Item {
        anchors.fill: parent

        layer.enabled: true

        Column {
            anchors.centerIn: parent
            Text { text: "The quick brown fox jumps over the lazy dog" }

            Text { text: "Hello world" }
        }
    }
}