Switch: using exclusiveGroup doesn't work

import QtQuick 2.1
import QtQuick.Controls 1.1

ApplicationWindow {
    visible: true
    width: 360
    height: 360

    Column {
        spacing: 20
        anchors.centerIn: parent
        ExclusiveGroup { id: group }
        Switch {
            id: cb
            exclusiveGroup: group
        }
        Switch {
            checked: true
            exclusiveGroup: group
        }
    }
}