public override void DidEncounterError (NSSpeechSynthesizer sender, uint characterIndex, string theString, string message)
		{
			logger.Warn (message);
		}
		public override void DidFinishSpeaking (NSSpeechSynthesizer sender, bool finishedSpeaking)
		{
			EventHandler handler = DidComplete;
			if (null != handler)
				handler (this, EventArgs.Empty);
		}