App becomes unresponsive with "QQuickItem::polish loop" warning

import QtQuick 2.2
import QtQuick.Controls 1.1

ApplicationWindow {
    visible: true
    width: 1024
    height: 768

    Item {
        width: 200
        height: 200

        Column {
            width: parent.width

            Rectangle {
                id: header
                width: parent.width
                height: 50

                Row {
                    Button {
                        text: "Click Me"
                    }
                }
            }

            Grid {
                id: grid
                columns: 2
                rowSpacing: 10
                columnSpacing: 10
                width: parent.width
                height: parent.height
            }
        }
    }
}