System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Windows.Forms.Control
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.UserControl
                     GrapeCity.ActiveReports.Design.ReportExplorer.ReportExplorer

Reference

GrapeCity.ActiveReports.Design.Win.v8 Assembly