Mouse Event problem

Hi all,

I have a ready simple calculater design.

and i learned the Action Script languge last month

i just tried to add a Mouse Lestiner for a buttons(actually it's not button but it customized to act like a button = the No. ZERO button = num0_btn as shown in the code below. )

but it doesn't work.

it works correct with the normal button ( = tst_btn ) as shown in the code below.

and this is the code:

------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ -----------------------------

var num0_btn:mx.controls.Button;

var tst_btn:mx.controls.Button;

var btnListener:Object = new Object();

     btnListener.click = function(evt:Object)

       {

          //do something
           trace("there is a button pressed");

        }

num0_btn.addEventListener("click", btnListener);
tst_btn.addEventListener("click", btnListener);

------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ ---------------------------------

Hoooooooooope to help me please. as soon as possible.

thx all,...................................................................................