Thank you for writing.
The SelectionChanging event seems like the right place do achieve the desired scenario. There you can access the already selected cells (via the SelectedCells collection of RadGridView) and the cell which attempts to be selected (vie the CurrentCell property of RadGridView). Here is a small sample:
sender, CancelEventArgs e)
(radGridView1.SelectedCells.Count > 0)
(radGridView1.SelectedCells.RowInfo != radGridView1.CurrentRow)
I hope this helps.
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