wpf BusyIndicator

  public class Indicator : UserControl
    {
        public Indicator()
        {
            this.InitializeComponent();
        }
        private void InitializeComponent() {
            Grid g = new Grid();
            this.Content = g;
            List<Path> pathlist = new List<Path>();

            for (int i = 0; i < 12; i++)
            {
                Path p = new Path();

                p.Data = Geometry.Parse("M 0,0 L -10,0 L -10,-60 L 0,-70 L 10,-60 L 10,0 Z");

                p.Stroke = new SolidColorBrush(Colors.DarkGreen);
                p.Fill = new SolidColorBrush(Colors.LawnGreen);
                p.Opacity = 0.2;

                TransformGroup tg= new TransformGroup();
                p.RenderTransform=tg;

                TranslateTransform tt = new TranslateTransform();
                tt.Y = -50;
                RotateTransform rt = new RotateTransform();
                rt.Angle = i * 30;
                tg.Children.Add(tt);
                tg.Children.Add(rt);


                DoubleAnimation da = new DoubleAnimation();

                da.From = 1.0;
                da.To = 0.2;
                da.Duration = new Duration(TimeSpan.FromSeconds(1));
                da.BeginTime = TimeSpan.FromMilliseconds(i * 1000 / 12);
                da.RepeatBehavior = RepeatBehavior.Forever;

                g.Children.Add(p);
                p.BeginAnimation(Path.OpacityProperty, da);



            }
        }
    }