Could you specify what exactly do you mean by "not working" - does it throw an error or it does not sort properly?
Also, could you please share what are the results if you:
-Remove the initial sort and try to sort the column on header click? Does it sort normally this time?
-If not, what happens if you convert the TimeSpan data to string? I know that it will now be sorting alphabetically but does it sort without problems?
The answers to these questions will help us narrow down the set of possible reasons for the erroneous behavior.
All the best,
the Telerik team
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