The ErrorVisualBeans beans are used in DSECoordinatedPanels or EmbeddedPanels
to display error messages. They are implemented as SpErrorList (to show a
single error message) and SpList (to show two or more error messages at the
same time). A new toolkit error bean must be a subclass of a Swing Component,
and must implement the ErrorVisualBean interface. (For more information on
the ErrorVisualBean interface, see the ErrorVisualBean interface description.)