AS3 Volume component. HELP!

Hello, I’m creating a custom video player using Flash AS3, and I’m having a serious problem with customizing the UI component volume bar. (see attached .SWF).

The handle is fully functional as far as controlling volume, but after the initial drag to decrease the volume, the handle cannot scrub the width of the volume bar anymore. Why might this be? All the other UI components such as the Play Button, Pause Button, Stop Button and even the buffering bar work just fine. This is for a client, and I’m on a pretty strict deadline, so if you have the answer to this most likely simple problem, I would be greatly appreciative.

Thanks in advance.