Gets the maximum number of Rows (MaxY), maximim number of columns (MaxX) as well as the
page coordinates and their corresponding string values relating to the event.
Declaration Syntax Remarks
For example, if the event is an Update, the coordinates are the ones
that have been updated in which case MaxY and MaxX have a value of -1
For a full description of how the supplied coordinates relate to the event,
see SubscriptionEventType.