At the moment, the SortExpression property is not available for the Lists widget. I have included a link
to a forum post which provides a workaround for this situation.
I have submitted a feature request
on your behalf. You can follow its progress in PITS.
I apologize for any inconvenience this causes you. Please let us know if you have any other questions.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items