The RibbonControl class encapsulates the ribbon controls.

Autodesk.AutoCAD.Customization.IImageContainer
    Autodesk.AutoCAD.Customization.RibbonControl
        Autodesk.AutoCAD.Customization.RibbonGalleryControl

Public Class RibbonControl
Inherits RibbonControlBase
Inherits IImageContainer

public class RibbonControl : RibbonControlBase, IImageContainer;