private void ReorganizeGroups(WGGrouping <char, Artist> element)
        {
            var oldArtists = TrackedArtists.Where(e => e.Key == element.Key).SelectMany(g => g.ToList()).ToList();

            oldArtists.AddRange(element.ToList());
            var group =
                TrackedArtists.Single(
                    e => e.Key == element.Key);
            var groupindex = TrackedArtists.IndexOf(group);

            group.Group = oldArtists
                          .GroupBy(a => a.DisplayName.ToLower().First())
                          .Select(groups => new WGGrouping <char, Artist>(groups)).Single();
            ExecuteOnDispatcher(() =>
                                TrackedArtists[groupindex] = group);
        }
 private void ReorganizeGroups(WGGrouping<char,Artist> element )
 {
     var oldArtists = TrackedArtists.Where(e => e.Key == element.Key).SelectMany(g => g.ToList()).ToList();
     oldArtists.AddRange(element.ToList());
     var group =
         TrackedArtists.Single(
             e => e.Key == element.Key);
     var groupindex = TrackedArtists.IndexOf(group);
     group.Group = oldArtists
         .GroupBy(a => a.DisplayName.ToLower().First())
         .Select(groups => new WGGrouping<char, Artist>(groups)).Single();
     ExecuteOnDispatcher(() =>
         TrackedArtists[groupindex] = group);
 }