Make a Button Stay in the Down State When Clicked

Hi everyone,
Does anyone know how to make a button stay in the down position in CS3, Actionscript 3.0?

I have 3 buttons, each with the same roll over state. What I’d like to do is when the button is clicked, it remains in the roll over state until something else happens.

Thanks!!!

yourButtonInstanceName.setMouseState(“down”)

Thats if you are using a button component.

That did not work.

got error:

1061: Call to a possibly undefined method setMouseState through a reference with static type flash.display:SimpleButton.

I do not know what that means. I am new to flash.

Thanks