private JPanel readSplitter(
      JPanel panel, Element splitterElement, Ref<EditorWindow> currentWindow) {
    final boolean orientation =
        "vertical".equals(splitterElement.getAttributeValue("split-orientation"));
    final float proportion =
        Float.valueOf(splitterElement.getAttributeValue("split-proportion")).floatValue();
    final Element first = splitterElement.getChild("split-first");
    final Element second = splitterElement.getChild("split-second");

    Splitter splitter;
    if (panel == null) {
      panel = new JPanel(new BorderLayout());
      panel.setOpaque(false);
      splitter = new Splitter(orientation, proportion, 0.1f, 0.9f);
      panel.add(splitter, BorderLayout.CENTER);
      splitter.setFirstComponent(readExternalPanel(first, null, currentWindow));
      splitter.setSecondComponent(readExternalPanel(second, null, currentWindow));
    } else if (panel.getComponent(0) instanceof Splitter) {
      splitter = (Splitter) panel.getComponent(0);
      readExternalPanel(first, (JPanel) splitter.getFirstComponent(), currentWindow);
      readExternalPanel(second, (JPanel) splitter.getSecondComponent(), currentWindow);
    } else {
      readExternalPanel(first, panel, currentWindow);
      readExternalPanel(second, panel, currentWindow);
    }
    return panel;
  }
 public void setAdText(@NotNull final String s, int alignment) {
   if (myAdComponent == null) {
     myAdComponent =
         HintUtil.createAdComponent(s, BorderFactory.createEmptyBorder(1, 5, 1, 5), alignment);
     JPanel wrapper =
         new JPanel(new BorderLayout()) {
           @Override
           protected void paintComponent(Graphics g) {
             g.setColor(Gray._135);
             g.drawLine(0, 0, getWidth(), 0);
             super.paintComponent(g);
           }
         };
     wrapper.setOpaque(false);
     wrapper.setBorder(new EmptyBorder(1, 0, 0, 0));
     wrapper.add(myAdComponent, BorderLayout.CENTER);
     myContent.add(wrapper, BorderLayout.SOUTH);
     pack(false, true);
   } else {
     myAdComponent.setText(s);
     myAdComponent.setHorizontalAlignment(alignment);
   }
 }