Unloading .flv

I have a main .swf file that loads another .swf file which contains a .flv video using the Media Playback component. Works great. Only problem is that, when I close the loaded .swf file containing the .flv, the audio still plays… The entire screen goe’s away, but the audio still remains. I’ve tried many differenct solutions on unloading certain things to no avail. any ideas? is there an unload .flv command? or maybe some kind of buffering issue? Thanks for any tips.