System.Object
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         C1.WPF.Chart.Annotation.AnnotationBase
            C1.WPF.Chart.Annotation.Image
            C1.WPF.Chart.Annotation.Shape
               C1.WPF.Chart.Annotation.Circle
               C1.WPF.Chart.Annotation.Ellipse
               C1.WPF.Chart.Annotation.Line
               C1.WPF.Chart.Annotation.Polygon
               C1.WPF.Chart.Annotation.Rectangle
               C1.WPF.Chart.Annotation.Square
            C1.WPF.Chart.Annotation.Template
            C1.WPF.Chart.Annotation.Text
         C1.WPF.Chart.Annotation.AnnotationLayer

Reference

C1.WPF.FlexChart.4 Assembly