Hi,
Thank you for your interest in syncfusion products.
We have analyzed your requirements and at present there is no support for UnBoundColumns. However we can achieve your requirement in sample level itself.Also we have prepared a sample based on your requirement. Please find the sample under the following link.
Sample:
http://www.syncfusion.com/downloads/Support/DirectTrac/General/UnBoundColumnContextMenu-453438889.zipPlease let us know if this helps.
Thanks,
Ramesh