Toolbar Class. ToolbarItems is the collection within this class that contains all the components that make up the toolbar. This collection is comprised of objects derived from ToolbarItemBase.

Autodesk.AutoCAD.Customization.ElementBase
    Autodesk.AutoCAD.Customization.VersionableElement
        Autodesk.AutoCAD.Customization.CustomizationElement
        Autodesk.AutoCAD.Customization.ICustomizationContainer
            Autodesk.AutoCAD.Customization.QuickAccessToolbar

Public Class QuickAccessToolbar
Inherits CustomizationElement
Inherits ICustomizationContainer

public class QuickAccessToolbar : CustomizationElement, ICustomizationContainer;