Доступ к internal типу в AlphaVSS - C#

IVssImplementation vss = VssUtils.LoadImplementation();
            _backup = vss.CreateVssBackupComponents();
            _backup.InitializeForBackup(null);
using (IVssAsync async = _backup.GatherWriterMetadata())
            {
                // Because allowing writers to prepare their metadata can take
                // a while, we are given a VssAsync object that gives us some
                // status on the background operation.  In this case, we just
                // wait for it to finish.
                async.Wait();
            }