protected JComponent createCenterComponent() {
    Splitter splitter = new OnePixelSplitter(false);
    splitter.setSecondComponent(myUsagePreviewPanel);
    JBLoadingPanel loadingPanel = new JBLoadingPanel(new BorderLayout(), this, 1000);
    loadingPanel.add(ScrollPaneFactory.createScrollPane(myTree), BorderLayout.CENTER);
    splitter.setFirstComponent(loadingPanel);
    return splitter;
  }
protected JComponent createCenterComponent()