Thank you for using our services. Can you, please take a look at the provided sample I've just tested, and OrderByDescending was working fine when providing a RadGrid with the results.
var fluent = App.WorkWith();
var newsItems = fluent.NewsItems()
.Where(ni => ni.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live).Get().ToList()
.OrderByDescending(ni => ni.PublicationDate);
Grid1.DataSource = newsItems;
Can you, please share with us some more details on your custom widget implementation, maybe the behavior you are describing is related to it?
All the best,
the Telerik team
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