Particle Effect in AS3?

Attached is the .fla for an old school AS1 particle effect.

It uses duplicateMovie and removeMovieClip to create the particle.

I am a complete newb and cannot figure out how to update this effect.

I know to use addChild and removeChild, but I could not figure out how to get an event listener to removeChild at the end of the guided tween, if that makes sense??

Please Help!

Thanx