private void SetSourceFromXaml(BitmapImage brush, string xaml)
 {
     try
     {
         var fe = XamlReader.Load(xaml) as FrameworkElement;
         fe.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
         fe.Arrange(new Rect(0, 0, fe.DesiredSize.Width, fe.DesiredSize.Height));
         WriteableBitmap bmp = new WriteableBitmap(fe, null);
         var stream = bmp.SaveAsPng();
         brush.SetSource(stream);
     }
     catch
     {
     }
 }