System.Object
   C1.Chart.DiscreteColorScaleBase
      C1.WPF.Chart.Extended.DiscreteColorScale
   C1.Chart.GradientColorScaleBase
      C1.WPF.Chart.Extended.GradientColorScale
   C1.WPF.Chart.Extended.DiscreteColorScale.Interval
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         C1.WPF.Chart.Axis
            C1.WPF.Chart.Extended.ColorAxis
         C1.WPF.Chart.Series
            C1.WPF.Chart.Extended.Heatmap

Reference

C1.WPF.FlexChart.Extended.4 Assembly