Dynamic MovieClip reference

Okay, how does one reference a MovieClip instance dynamically in AS 3.0?

Example, I create a new instance of a "marker" MovieClip class that inherently has within it a series of embedded MovieClips labeled: "m1", "m2", "m3" etc ... and I want to be able to dynamically reference those embedded MCs.  I used to do this all the time in AS 2.0, and can't recall how to do it in AS 3.0.

I know it is something like this:

number = 1; marker = new StaticMarker(); var thisMarker = this.marker.m[number]; thisMarker.visible = true;