The feature is implemented and will be included in the upcoming 2016 Q1 release.
The Telerik Team
@Ahmed: The work on this feature is currently started. If everything goes normally, expect it to be included in 2016 Q1 release.
Any status update regarding this feature?
Please update RichTextbox with a Repeat as Row Header ASAP.
I also find this functionality essential to our document processing capabilities.
Please update RichTextbox with a Repeat as Row Header as soon as possible.
This is an essential feature for us to provide Word-like experience with tables
This is a very important feature for us, and we would appreciate it if you would include this feature in your schedule in the upcoming release!