protected Color getHeaderBackground()
    {
        Color c = UIManager
                .getColor("SimpleInternalFrame.activeTitleBackground");
        if (c != null)
            return c;
        if (LookUtils.IS_LAF_WINDOWS_XP_ENABLED)
            c = UIManager.getColor("InternalFrame.activeTitleGradient");
        return c != null ? c : UIManager
                .getColor("InternalFrame.activeTitleBackground");
    }