Hello Shay,
The best approach would be to use javascript in order to avoid postbacks. I have attached a sample RadGrid web site where an approach resembling your requirement is implemented. Please check out the attached application and let me know if it helps you.
In case you have different requirements or further instructions, please elaborate on your specific requirement and send us screenshots or video demonstrating the exact desired behavior.
Regards,
Eyup
Telerik
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