API Reference > ui-framework > Notification > MessageManager > onActivityMessageCancelledEvent onActivityMessageCancelledEvent StaticReadonly onActivityMessageCancelledEvent: ActivityMessageCancelledEvent = ... The ActivityMessageCancelledEvent is fired when an Activity message is cancelled via endActivityMessage(ActivityMessageEndReason.Cancelled) or by the user clicking the 'Cancel' link. Defined in ui/framework/src/ui-framework/messages/MessageManager.tsx Line 160 Last Updated: 12 June, 2024