private void ChangeTileContentButton_Click(object sender, RoutedEventArgs e)

        {

            var tileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileSquare150x150Text01);

            var tileAttributes = tileXml.GetElementsByTagName("text");

            //tileAttributes[0].AppendChild(tileXml.CreateTextNode(MyTextBlock.Text));

            tileAttributes[].InnerText = "";

            tileAttributes[].InnerText = "";

            var tileNotification = new TileNotification(tileXml);

            TileUpdateManager.CreateTileUpdaterForApplication().Update(tileNotification);

        }