C# - Commit Current Dirty Cell On Clicking Save Button From Any Datagridview On Form?

I have a form with multiple datagridviews. On save the entire dataset will be serialized to a strongly typed property bound to a sql varbinary(max) Works fine. Of course the current "dirty" cell will not be saved as mentioned here :

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My problem is the user could be coming from any one of 20 datagridviews when they click SAVE. Is there any way, short of checking for a dirty cell in each datagridview to commit any dirty cell before the save ( clicking another textbox control before the save does the trick but calling the focus() of that textbox prior to the save does not ) I was thinking perhaps catching the event of leaving the grid but it seems the base problem is clicking a button (for reasons I think I understand) does not fire lostfocus events for the current control and it doesn't seem the click handler args knows what the last current selected control is.