public virtual IEnumerator <IGridRow <T> > GetEnumerator()
        {
            if (CurrentRows == null)
            {
                IQueryable <T> items = Grid.Source;
                foreach (IGridProcessor <T> processor in Grid.Processors.Where(proc => proc.ProcessorType == GridProcessorType.Pre))
                {
                    items = processor.Process(items);
                }

                foreach (IGridProcessor <T> processor in Grid.Processors.Where(proc => proc.ProcessorType == GridProcessorType.Post))
                {
                    items = processor.Process(items);
                }

                CurrentRows = items
                              .ToList()
                              .Select(model => new GridRow <T>(model)
                {
                    CssClasses = CssClasses?.Invoke(model)
                });
            }

            return(CurrentRows.GetEnumerator());
        }