An object passed to the event that contains the following properties:
Indicates whether or not any edits have been made to the Detail View. If isDirty is true, the current record has been edited.
The row number of the Grid row that fired the event. New record rows have negative row numbers.
Fires when the user tries to expand a closed row expander. If the event returns false, the action is cancelled.
To prevent the user from expanding the row, the event can return false. For example: