private boolean validateCutTimes()
    {
        for(VideoSectionPanel panel : results)
        {
            if (!panel.validateTimes())
            {
                //warning window
                JOptionPane.showMessageDialog(frame,
                    panel.errorMessage(),
                    "Warning - wrong time format",
                    JOptionPane.WARNING_MESSAGE);
                return false;
            }
        }
        
        return true;
    }