ActionScript 3.0 :: Add Event Listener To Scrolling Content?

I want to put some mouse event to scrolling text in dynamic text field.

for example. I type several sentences into one dynamic text field,

for each sentence, I want to have a different mouse event.

code like this:

sentenceA.addEventListener(MouseEvent.CLICK, functionA);
function functionA(evt:MouseEvent):void
{
trace("bla");
}

how can I add eventlistener to each sentence in the scrolling text? coz the position of the mouse event should move when the relative text scrolling..