Thank you for writing.
Such a column is not part of the columns package we offer. Still, I think I managed to get something working, which should get you started. Attached you can find a small sample, which demonstrates how to incorporate such a column, using RadRichTextEditor.
Note that since this approach uses controls (instead of elements), some visual glitches are possible as controls does not support clipping. In addition, if you are having a lot of rows, performance implications may occur for the same reason.
I hope that you find this useful.
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