Code

<html>
<head>
    <title>Bing Map</title>
    <script src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.3"></script>
<script type="text/javascript">

    var map;

    function OnPageLoad() {
        map = new VEMap('myMap');
        map.LoadMap();
        map.HideDashboard();
        LoadShapes();
        map.AttachEvent("onmouseover", shapeInfoOver);
        map.AttachEvent("onmouseout", shapeInfoOut);
        map.AttachEvent("onmousemove", shapeInfoOver);
    }
    var infobox = "";
    function ShowInfoBox(polygon) {
        HideInfoBox();
        map.ShowInfoBox(polygon, new VELatLong(polygon.Latitude + 5, polygon.Longitude +5), new VEPixel(0, 0));
    }

    function HideInfoBox() {
        map.HideInfoBox();
    }

    function shapeInfoOver(e) {
        var Green = new VEColor(0, 255, 0, 0.2);
        if (e.elementID != null) {
            var polygon = map.GetShapeByID(e.elementID);
            polygon.SetFillColor(Green);
            polygon.SetLineColor(new VEColor(0, 0, 0, 0.2));
            var infobox = "<TABLE  WIDTH=50 ;position: absolute;top: 0px;left: 20px;padding: 0px;border: 0px;background-color: black;><TD ALIGN=center><FONT COLOR=black; SIZE=2>msg</FONT></TD></TABLE>";
            map.ClearInfoBoxStyles();
            polygon.SetDescription(infobox);
            ShowInfoBox(polygon);
        }
    }

    function shapeInfoOut(e) {
        var White = new VEColor(245, 242, 239, 0);
        if (e.elementID != null) {
            var polygon = map.GetShapeByID(e.elementID);
            polygon.SetFillColor(White);
            polygon.SetLineColor(new VEColor(0, 0, 0, 0));
            polygon.HideIcon();
        }
    }


    function LoadShapes() {
        var layer = new VEShapeLayer();
        var Green = new VEColor(0, 255, 0, 0.5);
        var White = new VEColor(245, 242, 239, 0);
        var polygon = new VEShape(VEShapeType.Polygon,
  [
    new VELatLong(41, -102),
    new VELatLong(37, -102),
    new VELatLong(37, -109),
    new VELatLong(41, -109)
  ]);
        polygon.SetTitle("Colorado");

        polygon.SetDescription(infobox);
        polygon.SetLineColor(new VEColor(0, 0, 0, 0));
        polygon.SetFillColor(White);
        layer.AddShape(polygon);

        var polygon1 = new VEShape(VEShapeType.Polygon,
  [
    new VELatLong(45, -104),
    new VELatLong(41, -104),
    new VELatLong(41, -111),
    new VELatLong(45, -111)
  ]);
        polygon1.SetTitle("Wyoming");

        polygon1.SetDescription(infobox);
        polygon1.SetLineColor(new VEColor(0, 0, 0, 0));
        polygon1.SetFillColor(White);
        layer.AddShape(polygon1);

        map.AddShapeLayer(layer);
        polygon.HideIcon();
        polygon1.HideIcon();

    }
</script>
</head>
<body onload="OnPageLoad();">
  <div id="myMap" style="position:relative;width:1000px;height:400px;"></div>
</body>
</html>