This class encapsulates the RibbonDataBoundDropDown custom controls.

Autodesk.AutoCAD.Customization.ElementBase
    Autodesk.AutoCAD.Customization.VersionableElement
        Autodesk.AutoCAD.Customization.CustomizationElement
            Autodesk.AutoCAD.Customization.RibbonItem
            Autodesk.AutoCAD.Customization.IImageContainer
                Autodesk.AutoCAD.Customization.RibbonDataBoundDropDown

Public Class RibbonDataBoundDropDown
Inherits RibbonItem
Inherits IImageContainer

public class RibbonDataBoundDropDown : RibbonItem, IImageContainer;