Problem in using button to stop an embedded video

Hello,

I am using Flash MX 2004.

I have an embedded video in Layer 1. I create a new Layer 2 and wish to add a button to stop the embedded video.

I change the Instance Name of the embedded video to my_video. I then add the following ActionScript to the button:

on(click) {
my_video.stop();
}

However when I tested the movie, the button is not working. What is the problem?

Thanks and best regards

Alex