Loading Movies in Rollover

Hello All,

I am creating a flash presentation and I have rollover effects assigned to 
particular buttons.  I created another SWF and assigned the behavior "Load

Movie" to a button's rollover (down).  The SWF that plays has the
"Unload" 
behavior assigned to its last frame.

The movie plays exactly as I want it to in the correct position and looks 
fine; however, it doesn't unload.  It plays and then stays put.

The SWF is loaded over the top of other screen objects, so I need the darn 
thing to unload itself when it finishes playing.

Anyone know why the SWF movie that I loaded isn't executing its behavior 
(unloading itself) at its last frame?  This issue is holding up my whole 
project.

Thanks in advance for any suggestions provided!