Indicates whether a Pop-up Window Show Action’s pop-up Window is modal.
true if the current Pop-up Window Show Action’s pop-up Window is modal; otherwise, false.
This property is processed by built-in Action Containers that visualize Pop-up Window Show Actions. You can implement a custom Action Container that will not consider this property and will always display a nonsizable pop-up Window.
By default, the IsModal property is set to true.