Is it possible to disable radio button group?

I try to add inside the code but when I run the file, I click pause timer button, the next button still can direct to the next page

var pause:Boolean = false;

pausebtn.addEventListener(MouseEvent.CLICK, onClick);

function onClick(e:MouseEvent):void

{

    if(pause == false)

    {

        countdownTimer.stop();

        pause = true;

  a1.enabled = false; // <------------------------------------- HERE IS MY ADJUSTMENT to disable the radio button

  //mygroup1.mouseEnabled = false;

  //mygroup1.mouseChildren = false;

    }

    else

    {

        countdownTimer.start();

        pause = false;