Exits edit mode but reverts to the previous value similar to what happens when the end user chooses Cancel from the displayed dialog.
ShowPrompt
ShowPrompt:0
Displays a dialog to the end user to determine the action to be taken. The options displayed will depend on the ErrorStyle of the [[DataValidationRule.errorStyle]]
StayInEditMode
StayInEditMode:1
Keeps the cell in edit mode with the invalid value.
Enumeration used to identify how the validation error event should be handled.