property OnChange: TNotifyEvent;
OnChange is an abstract change notification event, which is called by some of the descendants of TCustomPaintBox32 immediately after changes have been made to their contents.
In TCustomImage32, for example, this includes redirection of change notification events from the contained bitmap and from layers.
This event, however, is not called by TCustomPaintBox32 control itself, unless you call the Changed method explicitly.
Change notification may be disabled with BeginUpdate call and re-enabled with EndUpdate call.
TCustomImage32, BeginUpdate, Changed, EndUpdate, TCustomPaintBox32
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