This .NET class wraps the AcDbObjectContextManager ObjectARX class. 

Exposes the collection of context types supported by the drawing. 

Each Database exposes an ObjectContextManager which can be used to register, unregister, and enumerate custom context collections.

Autodesk.AutoCAD.DatabaseServices.ObjectContextManager

Public Class ObjectContextManager
Inherits RXObject

public class ObjectContextManager : RXObject;