You can register objects that implement the IExceptionMessageService interface using the ServiceRegister interface's RegisterService and UnregisterService methods.
ServiceRegistry.GetInstance().RegisterService(typeof(Sybase.Mobile.Framework.IExceptionMessageService), new CustomExceptionMessageService()); ... ServiceRegistry.GetInstance().UnregisterService<Sybase.Mobile.Framework.IExceptionMessageService>(typeof(Sybase.Mobile.Framework.IExceptionMessageService));