private void unsubscribeFromEvents()
{
if (_phraseSpeakScanner != null)
{
_phraseSpeakScanner.EvtDone -= PhraseSpeakFormEvtDone;
_phraseSpeakScanner.FormClosing -= PhraseSpeakFormClosing;
_phraseSpeakScanner.EvtShowScanner -= PhraseSpeakFormEvtShowScanner;
}
}
}