Really sorry about the double post, but for some reason I am no longer able to reply to my own posts so here is my response to Ned:
it is called Play_button. This time I ran it and got a different error, (Access of undefined property Play_button)but is still in the same direction as the first one.
I renamed the button name and changed the code, still to the same result.
Where are you changing the code? You didn't answer my question regarding what you see in the library either. The name you use in the code should be the name you assign to the button after it is placed on the stage... it gets assigned in the Properties panel where it shows "<Instance name>"