Problem with: mybutton.useHandCursor = false;

i am using:
mybutton.useHandCursor = false;

The button I am using the script on however is not in the main timeline of the movie. I have tried using the script in the first frame of the timeline of the MC that the button exists in.

I have also tried using
_root.content.mybutton.useHandCursor = false;

this was used in the main timeline, no luck with that either.

what am I doing wrong?

thanks!