Netstream - handling the progress of flv play

Hi, This might be an minuscule problem, but i really cudn’t locate an answer!

I am making an flv player using NetConnection/NetStream concept. As the video plays i’m wanted to show the elapsed time of the flv in a textfield. Now i’m not able to locate the particular event or a method which gets fired continuously till the video is playing.

A similar thing can be achieved by using FLVPlayback component, playheadUpdate event.

this.c_mcVideoPlayer.addEventListener("playheadUpdate", Delegate.create(this, onPlayheadUpdate));

function onPlayheadUpdate(evt:Object)
   //do the task.

How can i do the same using NetStream ?