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It should be possible to define a complex type based on an existing one in Design View. * Add an entry into properties window. * Add a contextual menu action. More info here: http://xdesign-tools.czech.sun.com/usability/jse/jse9-coke-endToEnd/report.html#NoWayToCreateSubtypeInDesignView
Another finding also here: http://xdesign-tools.czech.sun.com/usability/jse/jse9-coke-endToEnd/report.html#Properties_BaseType