Handling ApplicationWindow QML2 Manipulations

Is there a way to handle keypress events in the ApplicationWindow of the component QtQuick.Controls

? The Qt5.3 documentation does not provide any way to do this. Also, it says that Keys

it only exists in Item

-objects. When I try to handle the keypress event, it says " Failed to bind Keys property to: ApplicationWindow_QMLTYPE_16 (0x31ab890) is not an element ":

import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.1
import QtQuick.Window 2.1


ApplicationWindow {
    id: mainWindow
    visible: true
    width: 720
    height: 405
    flags: Qt.FramelessWindowHint
    title: qsTr("test")

    x: (Screen.width - width) / 2
    y: (Screen.height - height) / 2

    TextField {
        id: textField
        x: 0
        y: 0
        width: 277
        height: 27
        placeholderText: qsTr("test...")
    }

    Keys.onEscapePressed: {
        mainWindow.close()

        event.accepted = true;
    }
}