protected void clear(JComponent comp) {
      int nCompCount = comp.getComponentCount();
      ArrayList aListComps = new ArrayList();

      for (int i = 0; i < comp.getComponentCount(); i++) {
        Component compChild = comp.getComponent(i);
        if (compChild instanceof JComponent) {
          JComponent jcomp = (JComponent) compChild;
          if (jcomp instanceof JCheckBox || jcomp instanceof JTextField) aListComps.add(comp);
          else clear(jcomp);
        }
      }
      clear(aListComps);
    }
  public boolean isToDrawMacCorner() {
    if (!SystemInfo.isMac || myComponent.getComponentCount() <= 0) {
      return false;
    }

    if (myComponent.getComponentCount() > 0) {
      Component component = myComponent.getComponent(0);
      if (component instanceof JComponent
          && Boolean.TRUE.equals(((JComponent) component).getClientProperty(SUPPRESS_MAC_CORNER))) {
        return false;
      }
    }

    return true;
  }