private void setupCentralPanel() {
    myCentralPanel.removeAll();
    if (myUsagePreviewPanel != null) {
      Disposer.dispose(myUsagePreviewPanel);
      myUsagePreviewPanel = null;
    }
    JScrollPane pane = ScrollPaneFactory.createScrollPane(myTree);

    if (UsageViewSettings.getInstance().IS_PREVIEW_USAGES) {
      Splitter splitter =
          new Splitter(false, UsageViewSettings.getInstance().PREVIEW_USAGES_SPLITTER_PROPORTIONS);
      pane.putClientProperty(UIUtil.KEEP_BORDER_SIDES, SideBorder.RIGHT);

      splitter.setFirstComponent(pane);
      myUsagePreviewPanel = new UsagePreviewPanel(myProject);
      myUsagePreviewPanel.setBorder(IdeBorderFactory.createBorder(SideBorder.LEFT));
      Disposer.register(this, myUsagePreviewPanel);
      splitter.setSecondComponent(myUsagePreviewPanel);
      myCentralPanel.add(splitter, BorderLayout.CENTER);
    } else {
      myCentralPanel.add(pane, BorderLayout.CENTER);
    }
    myCentralPanel.add(myButtonPanel, BorderLayout.SOUTH);

    myRootPanel.revalidate();
  }
  @NotNull
  private JComponent createHintComponent(
      @NotNull String text,
      @NotNull final FindUsagesHandler handler,
      @NotNull final RelativePoint popupPosition,
      final Editor editor,
      @NotNull final Runnable cancelAction,
      final int maxUsages,
      @NotNull final FindUsagesOptions options) {
    JComponent label =
        HintUtil.createInformationLabel(suggestSecondInvocation(options, handler, text + " "));
    InplaceButton button =
        createSettingsButton(handler, popupPosition, editor, maxUsages, cancelAction);

    JPanel panel =
        new JPanel(new BorderLayout()) {
          @Override
          public void addNotify() {
            mySearchEverywhereRunnable =
                new Runnable() {
                  @Override
                  public void run() {
                    searchEverywhere(options, handler, editor, popupPosition, maxUsages);
                  }
                };
            super.addNotify();
          }

          @Override
          public void removeNotify() {
            mySearchEverywhereRunnable = null;
            super.removeNotify();
          }
        };
    button.setBackground(label.getBackground());
    panel.setBackground(label.getBackground());
    label.setOpaque(false);
    label.setBorder(null);
    panel.setBorder(HintUtil.createHintBorder());
    panel.add(label, BorderLayout.CENTER);
    panel.add(button, BorderLayout.EAST);
    return panel;
  }