API Reference > ui-framework > Notification > MessageManager > onActivityMessageCancelledEvent onActivityMessageCancelledEvent Static onActivityMessageCancelledEvent: ActivityMessageCancelledEvent = new ActivityMessageCancelledEvent() The ActivityMessageCancelledEvent is fired when an Activity message is cancelled via IModelApp.notifications.endActivityMessage(ActivityMessageEndReason.Cancelled) or by the user clicking the 'Cancel' link. Defined in ui/framework/src/ui-framework/messages/MessageManager.tsx Line 138 Last Updated: 13 June, 2024