Load Mc on the background and make it play

i´m using Flash pro 2004 and would like to make a mc to download on the background while the movie is playing, and when the movie gets to frame 200 to play thge loaded mc.

How to make it work?

set the visibility of the MC your loading into = false and then on frame 200 change the visibility = true.

this.yourMC._visible = false; (or true)