Controlling SWF that were loaded externally

I have posted a similiar question and looked all over the place but it just doesn’t seem to work. I am trying to have a play and stop button that controls a externally loaded swf and I just can get it to work… I am using the following AS…

[AS]
on (release) {
_root.container.transition.stop();
}
[/AS]

My container is obviously called “container” and my swf that is loaded is called “transition” and it just won’t work. Does anyone have any suggestions? Thanks

Mike