System.Object
   System.EventArgs
      C1.Xamarin.Forms.Chart.Interaction.PositionChangedArgs
   Xamarin.Forms.BindableObject
      C1.Xamarin.Forms.Chart.Interaction.TranslateBehavior
      C1.Xamarin.Forms.Chart.Interaction.ZoomBehavior
      Xamarin.Forms.Element
         Xamarin.Forms.VisualElement
            Xamarin.Forms.View
               C1.Xamarin.Forms.Chart.Interaction.C1LineMarker

Reference

C1.Xamarin.Forms.Chart Assembly