Thank you for writing.
was added to RadGridView back in Q1 2014 (2014.1.226), so if you are using older version, this is the reason you cannot see the property.
In order to benefit from the new functionality feel free to upgrade to at least Q1 2014 (I would recommend our latest version).
I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.
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