property OnChange: TNotifyEvent;
OnChange is called immediately after the object changes. For example, TNotifiablePersistent's descendant TBitmap32, uses the OnChange event to notify its parent that something was changed in a bitmap, and the screen image must be updated.
Generation of OnChange events can be prevented by calling BeginUpdate.
TBitmap32, TNotifiablePersistent, BeginUpdate, Changed
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