This class represents a toolbar button.

Autodesk.AutoCAD.Customization.ElementBase
    Autodesk.AutoCAD.Customization.VersionableElement
        Autodesk.AutoCAD.Customization.CustomizationElement
            Autodesk.AutoCAD.Customization.ToolbarItemBase
            Autodesk.AutoCAD.Customization.IReference
                Autodesk.AutoCAD.Customization.ToolbarButton

Public Class ToolbarButton
Inherits ToolbarItemBase
Inherits IReference

public class ToolbarButton : ToolbarItemBase, IReference;