QtObject{} Crashes QtC Designer: "Qt Quick Emulation Crashed"

import QtQuick 2.2
import QtQuick.Controls 1.1

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    menuBar: MenuBar {
        Menu {
            title: qsTr("File")
            MenuItem {
                text: qsTr("Exit")
                onTriggered: Qt.quit();
            }
        }
    }

    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
    QtObject{
        id: cartesian
        property point  center: Qt.point(20,20)       
        property rect spaceRect: Qt.rect(0,0., 1., 1.)
        property color  gridColor1: "#333333"
    }
}