I’m a bit confused, you said when you dropped it into the timeline the button doesnt play the little movie so where was it sitting when it did work? Could you be a lil more specific and maybe post the fla file?
is dropzone an empty movie clip above the button??
if thats what making the "cool " effect then you need the target mc to be above it . or someplace visible… use the code lostinbeta gave you and it should work…