如何根据其他单元格值使单元格可编辑

i have a gridView and i have to make a cell editable based on the value of the cell beside of it. Like if the cell of second column is having "AF" value then the cell of the first column will become editable. I got the solution using CellClick event. But the problem is if try keyboard Down arrow or Enter button to go to next cell of the first column i am not able to make it editable.i have a gridView and i have to make a cell edi