private void setupCentralPanel() {
    ThreadingAssertions.assertEventDispatchThread();

    JScrollPane treePane = ScrollPaneFactory.createScrollPane(myTree);
    myPreviewSplitter = new OnePixelSplitter(false, 0.5f, 0.1f, 0.9f);
    myPreviewSplitter.setFirstComponent(treePane);

    myCentralPanel.add(myPreviewSplitter, BorderLayout.CENTER);

    updateUsagesContextPanels();

    myCentralPanel.add(myAdditionalComponent, BorderLayout.SOUTH);
    myAdditionalComponent.add(myButtonPanel, BorderLayout.SOUTH);
  }
private void setupCentralPanel()