Thank you for writing.
In order to achieve this task, you would need to create a custom search cell
having a RadMaskedEditBoxElement
as a child. Then you would be able to set a thousand separator mask to this element.
I am sending you attached a project demonstrating a sample implementation. I am also sending you a gif file showing the result on my end.
I hope this helps. Should you have further questions please do not hesitate to write back.
Do you need help with upgrading your AJAX, WPF or WinForms project? Check the Telerik API Analyzer
and share your thoughts.