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This is a result of a TCA from the architectural review on the xml/multiview module. The addModifier facility should be made extensible or at least provide addModifiers for all possible widgets in the UI.
May be there can be something more universal like addModier(JComponent c) to enable adding different types of JComponent. The intention was to specify a set of UI Componets that are used to modify the data model in particular panel. Then the setData(JComponent, Object value) is called everytime when data are changed in JComponent.