Problem with AddListener

this is my code…

var myListener:Object = new Object();
Key.addListener(myListener);
myListener.onKeyDown = myOnKeyDown;
Accessibility.updateProperties();
function myOnKeyDown()
{
if (Key.isDown(Key.CONTROL) && Key.getCode() == 55)
{
trace(“right”);
}
}

here i used the key 7 along with the control key to check a specified action.
wen i am trying to use some other keys instead of key 7, it’s not working…
like when i am using key A or something like that, the function is not working in a proper way…
can anybody help me…
plz…