private JComponent createDefaultContent(Configurable configurable) {
    JComponent content = new JPanel(new BorderLayout());
    content.setBorder(JBUI.Borders.empty(11, 16, 16, 16));

    Configurable.Composite compositeGroup = ObjectUtils.tryCast(configurable, Configurable.Composite.class);
    if (compositeGroup == null) {
      String description = IdeBundle.message("label.select.configuration.element");
      content.add(BorderLayout.CENTER, new JLabel(description, SwingConstants.CENTER));
      content.setPreferredSize(JBUI.size(800, 600));
    }
    else {
      ConfigurableGroup configurableGroup = ConfigurableWrapper.cast(ConfigurableGroup.class, configurable);
      String description = configurableGroup != null ? configurableGroup.getDescription() : null;
      content.add(BorderLayout.CENTER, createConfigurablesListPanel(description, Arrays.asList(compositeGroup.getConfigurables()), this));
    }

    JScrollPane pane = createScrollPane(content, true);
    pane.setHorizontalScrollBarPolicy(HORIZONTAL_SCROLLBAR_NEVER);
    return pane;
  }
private JComponent createDefaultContent(Configurable configurable)