+Notification is an overridden method used to perform actions needed +when a component is added to or removed from the class instance. It calls the +inherited method on entry to remove the free notification for the component +and to signal the Notification method for any child components. In TScreen, it +ensures that an internal member used to track the value in ActiveControl or +ActiveCustomForm is Nil'd when AComponent is removed and it is stored +in one of the members. +
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