buttonMode should be simple right?

Hi i have a button on the main time line,
it is called btn1,

now all i want to do is set it so that the mouse doesn’t show when i scroll over it but so that it still will act as a button on rollover.

this should be

btn1.buttonMode = false;

right?

i get this error in the output

ReferenceError: Error #1056: Cannot create property buttonMode on flash.display.SimpleButton.
at home_fla::MainTimeline/frame1()

i am putting the action script in the first frame of the timeline
any help please

im a fool,
ive got it.
closing thread

thanks