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[0].InnerText = "1234";
            tileAttributes[1].InnerText = "5678";
            var tileNotification = new TileNotification(tileXml);
            TileUpdateManager.CreateTileUpdaterForApplication().Update(tileNotification);
        }