GetLength from Event with Parameter

Hello,

I have easy task: GetLength.

voiceNew = RuntimeManager.CreateInstance ("event:/Voiceovers/voice1");
voiceNew.start ();
voiceNew.setParameterByName ("Language", voiceID);
voiceNew.getDescription(out EventDescription ed);
ed.getLength(out int len);
//len=0 everytime

This code works fine for simple event, but event with Parameter return 0.

I have one event with few languages and switch after start.
Parameter type = labeled.