private JComponent createCallSitesViewer() {
    Splitter splitter = new Splitter(true);
    myCallerEditor = createEditor();
    myCalleeEditor = createEditor();
    final JComponent callerComponent = myCallerEditor.getComponent();
    callerComponent.setBorder(IdeBorderFactory.createTitledBorder(RefactoringBundle.message("caller.chooser.caller.method"),
                                                                  false));
    splitter.setFirstComponent(callerComponent);
    final JComponent calleeComponent = myCalleeEditor.getComponent();
    calleeComponent.setBorder(IdeBorderFactory.createTitledBorder(getCalleeEditorTitle(),
                                                                  false));
    splitter.setSecondComponent(calleeComponent);
    splitter.setBorder(IdeBorderFactory.createRoundedBorder());
    return splitter;
  }
private JComponent createCallSitesViewer()