You could use:
var pos = sym.getPosition();
which give you the value in milliseconds.
Also you might get some inspiration from this tut;
Here's an old post that many have found informative. Ume-san has a symbol he's created and shared (it's using the old eglib format, but it should import okay).
Thank you for taking time to looking into it. That gave me some direction.
Well, I was able to finally acheive it taking reference from http://forums.adobe.com/message/4428446#4428446#4428446
For those who are interested and looking for similar solution - here is the link to it