function onSourceDownloadProgressChanged(sender, eventArgs) {
    sender.findName("uxStatus").Text =
        "Loading: " + Math.round((eventArgs.progress * 100)) + "%";
    //    sender.findName("uxProgressBar").ScaleY = eventArgs.progress * 356;
    var myHost = document.getElementById("Xaml1");
    var rectBar = sender.findName("rectBar");
    var rectBorder = sender.findName("rectBorder");
    if (eventArgs.progress) {
        rectBar.Width = eventArgs.progress * rectBorder.Width;
    }
    else {
        rectBar.Width = eventArgs.get_progress() * rectBorder.Width;
    }
}