DirectoryVirtualListView not working correctly

Hi Folks,

I am having a similar issue as mentioned Here in that a query for users name beginning with 'G' just brings back a set of random results (actually I get 10 records sorted into alphabetical order starting from 'A').

DirectorySearcher search = new DirectorySearcher(directoryEntry);
                        search.SearchRoot = null;
                        search.Asynchronous = false;
                        search.Filter = String.Format("(objectClass=User)");

                        SortOption sortOption = new SortOption() { Direction = SortDirection.Ascending, PropertyName = "displayName" };
                        search.Sort = sortOption;

                        DirectoryVirtualListView dvlv = new DirectoryVirtualListView();
                        dvlv.Target = searchCriteria.Trim();
                        dvlv.BeforeCount = 0;
                        dvlv.AfterCount = 10;
                        search.VirtualListView = dvlv;

SearchResultCollection collection = search.FindAll()

Just wondering if anyone knows what the issue would be?

Also, while 'collection' will contain 10 results, if I then make a call to search.VirtualListView.ApproximateTotal;  I get a COM exception as this property is not defined. If I breakpoint on the line, count 10 seconds and then check the value it will contain value  (the entire number set of the users in A/D - rather than the 5 users I expect to get back).

This is indicating to me that the search is running asynchronously rather than blocking until it has a valid result set.  Is there some way I can force it to wait until the search has completed so it does not throw an exception?

Regards

Andy