Thanks for contacting us and for your question.
property accepts strings in the format which you will normally use in the string.Format()
method. In other words, to achieve the desired behavior you will have to set the GroupFormatString
in your case.
We are going to revisit our online help content regarding this functionality and update it if needed.
I hope this helps.
Do not hesitate to get back to us in case you have further questions or need assistance.
the Telerik team
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