Autodesk.AutoCAD.Customization.ElementBase
    Autodesk.AutoCAD.Customization.VersionableElement
        Autodesk.AutoCAD.Customization.CustomizationElement
            Autodesk.AutoCAD.Customization.RibbonItem
                Autodesk.AutoCAD.Customization.RibbonPanelBreak

Public Class RibbonPanelBreak
Inherits RibbonItem

public class RibbonPanelBreak : RibbonItem;