Same as ListBox: If a cell is editable, a CellAction event occurs when the user finishes editing a cell. Row and Column are zero-based. "Finishing editing" is defined as exiting the cell after clicking in it. Tabbing out of the editable cell or clicking another cell triggers this event. Clicking a checkbox in a checkbox cell also qualifies as "finishing editing." The user doesn't necessarily have to change the contents. With two new parameters: PropertyName and Value.