procedure Notification(AComponent: TComponent; Operation: TOperation); virtual;
virtual void __fastcall Notification(TComponent* AComponent, TOperation Operation);
Forwards notification messages to all owned components.
Do not call the Notification method in an application. Notification is called automatically when the component specified by
AComponent is about to be inserted or removed, as specified by
Operation. By default, components pass along the notification to their owned components, if any.
A component can, if needed, act on the notification that a component is being inserted or removed. For example, if a component has object fields or properties that contain references to other components, it can check the notifications of component removals and invalidate those references as needed.