dynamic create Series ,difficult to create TrackBallInfoTemplate

[Si]

     Chart.Series.Add(new LineSeries
     {
      CategoryBinding = binding,
      ValueBinding = ...,
      StrokeThickness = 1,
      Stroke = ...,
      ItemsSource = vm.Datas,
      TrackBallInfoTemplate = // difficult to create
     });

 

TrackBallInfoTemplate is difficult to create, how can i only set a stringformat to use trackballinfo

[Si]

OK, i can build it by code,

 

            var dataTemplate = new DataTemplate();
            var stackPanel = new FrameworkElementFactory(typeof(StackPanel));
            var textBlock = new FrameworkElementFactory(typeof(TextBlock));
            stackPanel.AppendChild(textBlock);
            dataTemplate.VisualTree = stackPanel;
            s.TrackBallInfoTemplate = dataTemplate;
            s.ApplyTemplate();
            textBlock.SetBinding(TextBlock.TextProperty, new Binding("DataPoint.Value") { StringFormat = LineName + " - {0:0}" });