System.Object
   System.Collections.CollectionBase
      DataDynamics.ActiveReports.Toolbar.ToolsCollection
   System.EventArgs
      DataDynamics.ActiveReports.Toolbar.ToolClickEventArgs
   System.MarshalByRefObject
      System.ComponentModel.Component
         DataDynamics.ActiveReports.Toolbar.Tool
            DataDynamics.ActiveReports.Toolbar.Button
               DataDynamics.ActiveReports.Toolbar.CheckButton
            DataDynamics.ActiveReports.Toolbar.PlaceHolder
            DataDynamics.ActiveReports.Toolbar.Separator
         System.Windows.Forms.Control
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.UserControl
                     DataDynamics.ActiveReports.Toolbar.Toolbar
      System.Runtime.InteropServices.StandardOleMarshalObject
         System.Windows.Forms.AccessibleObject
            DataDynamics.ActiveReports.Toolbar.AccessibleToolbarButton
            System.Windows.Forms.Control.ControlAccessibleObject
               DataDynamics.ActiveReports.Toolbar.ToolbarAccessible

Reference

ActiveReports.Viewer3 Assembly