Can't access qt qml app with at-spi accessibility bridge

import QtQuick 2.2
import QtQuick.Controls 1.2

ApplicationWindow {

    id: mainWindow
    title: "Test program"
    width: 800; height: 600
    color: "gray"
    Accessible.name: "Test program"

    Button {
        text: "Test button"
        Accessible.name: text
        Accessible.description: "This button does " + text
        Accessible.role: Accessible.Button
        onClicked: console.log("clicked")
    }
}