protected String addStepComponent(@NotNull Component component) {
    if (component instanceof JPanel) {
      ((JPanel)component).putClientProperty(DIALOG_CONTENT_PANEL_PROPERTY, true);
    }

    String id = myComponentToIdMap.get(component);
    if (id == null) {
      id = Integer.toString(myComponentToIdMap.size());
      myComponentToIdMap.put(component, id);
      myContentPanel.add(component, id);
    }
    return id;
  }
protected String addStepComponent(@NotNull Component component)