QML keyboard focus does not work from Components in Loader

import Qt 4.7

Rectangle {
    anchors.fill: parent
    width: 200
    height: 200
    color: "#f88"
    Component.onCompleted: {
        console.log("TestComponent.onCompleted()");
        console.log("  width:", width);
    }

    focus: true

    onWidthChanged: {
        console.log("width changed to:", width);
    }

    Keys.onPressed: {
        console.log("on Key pressed", event.key);
    }
}

import Qt 4.7

Rectangle {
    width: 200
    height: 200

    Component {
        id: testComponent
        TestComponent {}
    }

    Loader {
        id: mainLoader
        anchors.fill: parent
        sourceComponent:  testComponent
    }
}

TestComponent.onCompleted()
  width: 200
width changed to: 0
width changed to: 0
width changed to: 200
width changed to: 640
width changed to: 200

import Qt 4.7

Rectangle {
    width: 200
    height: 200

    TestComponent {}
}