function onSourceDownloadProgressChanged(sender, eventArgs) {
    var myHost = document.getElementById("Xaml1");
   // var rectBar = myHost.content.findName("rectBar");
   // var rectBar1 = myHost.content.findName("rectBar1");
   // var rectBorder = myHost.content.findName("rectBorder");

    myHost.content.findName("_textLoader").Text = Math.round(eventArgs.progress * 100) + "%";
    myHost.content.findName("_textLoader1").Text =  Math.round(eventArgs.progress * 100) + "%";

   /* if (eventArgs.progress) {
        rectBar.Width = eventArgs.progress * rectBorder.Width;
        rectBar1.Width = eventArgs.progress * rectBorder.Width;
    }
    else {
        rectBar.Width = eventArgs.get_progress() * rectBorder.Width;
        rectBar1.Width = eventArgs.get_progress() * rectBorder.Width;
    }*/
    }