ActionScript 3.0 :: Using For Loop With A Subobject.addEventListener

Code:
for (var i:int = 0; i < 3; i++)
{
teacherOptions.btnAction[i].addEventListener(MouseEvent.CLICK, onBtnAction);
}

I have 3 buttons inside the teacherOptions movie clip and they are called

btnAction0
btnAction1
btnAction2

The code I am using doesn't seem to work...I don't want to create an event listener for each of the buttons beacuse they are going to be a lot more than 3, how can I do what I want to do but without errors ??

PD: I know that if the buttons weren't a suboject the correct code would be:

Code:
for (var i:int = 0; i < 3; i++)
{
this["btnAction" + i].addEventListener(MouseEvent.CLICK, onBtnAction);
}

But when it's a subobject you are dealing...things change.