Custom Video Progress Bar

I'm creating a simple little progress bar in AS3 to indicate
the progress of a video loading. I have a rectangle on the stage
called "bar_mc". I have this code, but it doesn't seem to work. As
near as I can tell the function "progressHandler" is never even
being called. What am I doing wrong? Any insight would be greatly
appreciated. Thanks!

Thank You! Your info and code provided the missing link for
me. I really appreciate the help.
I thought once I figured out how to control the "loading
progress bar" I would be able to figure out the "playhead knob",
but unfortunately, I seem to be missing something there as well. I
think the code must be close, but it isn't working. I think the
problem is finding the "current position" of the .flv. Help says
that NetStream.time will show "The position of the playhead, in
seconds." So I'm using this to find the curPos. But it always seem
to return 0.038 and so the playhead knob never moves. Here's the
code. Any help would be very much appreciated.

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