private void init() {
    setLayout(new VerticalLayout(5, VerticalLayout.BOTH, VerticalLayout.TOP));
    setBorder(makeBorder());

    add(makeTitlePanel());

    // USER_INPUT
    JPanel sizePanel = new JPanel(new BorderLayout());
    sizePanel.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));
    sizePanel.setBorder(
        BorderFactory.createTitledBorder(
            BorderFactory.createEtchedBorder(), getXPathAttributesTitle()));
    xpath = new XPathPanel();
    sizePanel.add(xpath);

    xml = new XMLConfPanel();
    xml.setBorder(
        BorderFactory.createTitledBorder(
            BorderFactory.createEtchedBorder(),
            JMeterUtils.getResString("xpath_assertion_option"))); // $NON-NLS-1$
    add(xml);

    add(sizePanel);
  }