Thank you for writing.
There is no way to detect which mouse button is clicked in CellDoubleClick. Nevertheless you can use the MouseDoubleClick and get the corresponding cell there:
sender, MouseEventArgs e)
(e.Button == System.Windows.Forms.MouseButtons.Left)
GridCellElement cell = radGridView1.ElementTree.GetElementAtPoint(e.Location)
I hope this will be useful. Should you have further questions, I would be glad to help.
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