Using different coloured font to indicate correct or incorrect answers

Hello,

I am using radio buttons to select a correct answer to a provided question.

This functionality is working fine for me.

Here is what I have in Actionscript 3:

import fl.controls.RadioButtonGroup;

var group:RadioButtonGroup = new RadioButtonGroup ("My Question")

A.group = group;

B.group = group;

C.group = group;

D.group = group;

A.label = "A";

B.label = "B";

C.label = "C";

D.label = "D";

submit.label = "Submit";

submit.addEventListener (MouseEvent.CLICK, submitletter);

function submitletter (event:MouseEvent):void{

  if (group.selection == null) {

  return;

  }

  if (group.selection.label == "D") {

  correctanswer.text = "Correct!";

  mytxt2.text = "Click the blue arrow to go to the next question.";

  } else {

  incorrectanswer.text = "Incorrect.";

  mytxt2.text = "(Remember from Lesson 3, a denominator is a number into which both numerators can divide.";

  }

}

My problem is my text field seems to store the first answer I choose, hence if I click another radio button, that text overwrites the existing.

I have created separate text fields in Flash for both "Correct" and "Incorrect".

I am a complete beginner with Flash and I am unsure whether the problem lies with my Flash layout or the my code in Actionscript.

Any suggestions would be appreciated.

Thank you.