JComponent center = factory.createViewer(new RadioBoxViewerCreator(), separator).getJComponent();
add(center, BorderLayout.CENTER);
text = new TextModel(mainModel.getSeparatorHelpText(), "text");
JComponent south = factory.createDefaultEditor(text).getJComponent();
south.setPreferredSize(new Dimension(500, 100));
south.setSize(new Dimension(500, 100));