Receiver utilizes the extra information

To extract the additional information, the handlers need to cast the passed notification to the appropriate class. Only HandleAddedShape is shown.

      void TShapeView::HandleAddedShape(const TNotification& notification)
  {
      const TAreaNotification* areaNotification = (const TAreaNotification*)&notification;
      Invalidate(areaNotification->GetShape()->GetLooseFitBounds());
  }
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