QML: State is not reset to default when using AnchorChanges

import Qt 4.7

Rectangle {
    id: root
    width:300; height:400

    TextEdit {
        id: e1
        anchors.horizontalCenter: root.horizontalCenter
        text: "<clear this text to move rectangle>"
    }

    Rectangle {
        id: rectangle
        color: "black"
        width:50; height:50
        y: 50

        states: [
            State {
                when: e1.text == ""
                AnchorChanges {
                    target: rectangle
                    anchors.bottom: root.bottom
                }
//                PropertyChanges {
//                    target: rectangle
//                    y: 200
//                }
            }
        ]
     }    
}