NSTableView Make Cell Editable Programmatically

The requirement is something like this, -- Similar to pList , there would be an + button, when user select this, it should make the last row editable,

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Any idea how its feasible, i am able to get which row is selected, but not able to proceed further.

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Just set the row to be editable via the provided methods.

NSCell *lastCell; // Find last cell
[lastCell setEditable: YES];