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FreeNotification(TGCollectionItem)

Ensures that Item is notified that the collection item is going to be destroyed. Use FreeNotification to register Item as a collection item that should be notified when the current collection item is about to be destroyed.

Notification(TGCollectionItem)

The Notification method is called when the object specified by the Item parameter is being destroyed.

Do not call the Notification method in an application. Notification is called automatically when the collection item specified by Item is about to be deleted.

A collection item can, if needed, act on the notification that a collection item is being removed. For example, if a collection has object fields or properties that contain references to other collection items, it can check the notifications of collection item removals and invalidate those references as needed.
 

NotifyAll

Notify all other TGCollectionItem objects that this object is being freed

RemoveFreeNotification(TGCollectionItem)

Disables destruction notification that was enabled by   FreeNotification. RemoveFreeNotification removes the collection item specified by the Item parameter from the internal list of objects to be notified that the collection item is about to be destroyed. Item is added to this list by a previous call to the FreeNotification method.

RemoveNotification(TGCollectionItem)

Remove the collection item from the list of items to be notified if this object is freed.