How get Netstream bytesLoaded variable when I use StageVideo on a modible device?

Hye,

I use a stageVideo player in my flex application for iOS.

All works well, but when I'm trying to make a loading bar to show the loading progression of the video, on the iphone, when I want get the netstream bytesLoaded variable, I always get zero whereas bytesTotal variable is correctly set.

Is it a bug from StageVideo Class using on mobile device?

Thank you for your help....