System.Object
   SpreadsheetGear.Commands.Command
      SpreadsheetGear.Commands.CommandPrint
         SpreadsheetGear.Windows.Forms.CommandPrint
   SpreadsheetGear.Windows.Forms.UIManager
   System.EventArgs
      SpreadsheetGear.Windows.Forms.ActiveTabChangedEventArgs
      SpreadsheetGear.Windows.Forms.ActiveTabChangingEventArgs
      SpreadsheetGear.Windows.Forms.CalculateEventArgs
      SpreadsheetGear.Windows.Forms.CellBeginEditEventArgs
      SpreadsheetGear.Windows.Forms.CellCancelEditEventArgs
      SpreadsheetGear.Windows.Forms.CellEndEditEventArgs
      SpreadsheetGear.Windows.Forms.RangeChangedEventArgs
      SpreadsheetGear.Windows.Forms.RangeSelectionChangedEventArgs
      SpreadsheetGear.Windows.Forms.RangeSelectionChangingEventArgs
      SpreadsheetGear.Windows.Forms.ScrollPositionChangedEventArgs
      SpreadsheetGear.Windows.Forms.ShapeActionEventArgs
      SpreadsheetGear.Windows.Forms.ShapeSelectionChangedEventArgs
      SpreadsheetGear.Windows.Forms.ShapeSelectionChangingEventArgs
      SpreadsheetGear.Windows.Forms.ShowErrorEventArgs
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Windows.Forms.Control
            SpreadsheetGear.Windows.Forms.FormulaBar
            SpreadsheetGear.Windows.Forms.WorkbookView
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.Form
                     SG.Windows.Forms.ExplorerBase
                        SpreadsheetGear.Windows.Forms.ChartExplorer
                        SpreadsheetGear.Windows.Forms.RangeExplorer
                        SpreadsheetGear.Windows.Forms.ShapeExplorer
                        SpreadsheetGear.Windows.Forms.WorkbookExplorer
                     SpreadsheetGear.Windows.Forms.WorkbookDesigner

Reference

SpreadsheetGear2012.Windows.Forms Assembly