//private Action<Func<object, object, int>, bool> _sortFunction;
        public DataGroupingViewModel()
        {
            DataViewOptions options = new DataViewOptions();

            options.GroupItemMetadataProvider = new GroupItemMetadataProvider();
            options.InlineFilters             = true;
            Projects = new DataView(options);

            Projects.BeginUpdate();
            Projects.SetFilter(MyFilter);
            Dictionary <string, object> filterArguments = new Dictionary <string, object>(
                "percentComplete", 0);

            Projects.SetFilterArgs(filterArguments);
            LoadData();
            SetGrouping();
            Projects.EndUpdate();
        }