[as3][umap]PositionControlの位置を動かす

package {
    // 省略
    public class MyUMap extends UMap {
        // 省略
        st = s;
        super();
        setSize(st.stageWidth,st.stageHeight);
        //setMapType("hybrid"); // normal / satellite
        setCenter(new LatLng(Params.MAP_INITIAL_CENTER_LAT,Params.MAP_INITIAL_CENTER_LNG), 2);

        animatePan = true;
        animateZoom = true;
        panSpeed = 10;
        enableScrollWheelZoom = false; // do this manually cause it zooms too much
        //zoomAtPointer = true; // looks like its useful when enabledScrollWheelZoom==true
        // define GoogleProvider with custom paths
        var settings :URLRequest = new URLRequest("http://www.afcomponents.com/components/g_map_as3/settings.xml?rand=" + Math.random());
        var language :URLRequest = new URLRequest("http://maps.google.com/maps?file=api&v=2")
        var copyright :URLRequest = new URLRequest("http://www.afcomponents.com/proxy/g_map_as3/copyright.php");
        control.provider = new GoogleProvider(false, settings, language, copyright);

        var pc :PositionControl = new PositionControl;
        pc.autoRepeat = true;
        //pc.y = 50; // ng
        //pc.stackAlignment = PositionControl.RIGHT; // ng
        //pc.stackAlignment = PositionControl.CENTER; // ng
        //pc.stackPadding = new Point(100,100); // ボタンが離れる！
        pc.offset = new Offset( 100, 100 ); // positioncontrolが左上から100,100に
        //pc.align = new Align( Align.RIGHT, Align.TOP ); // this is also ok
        pc.refresh();
        addControl(pc);
        addControl(new ZoomControl);
    }
}