Buttons to send html text to textfield

Question

How do I insert html text to a dynamic textfield?
The textfield's instance is called myDynamic. The first button is called button1_btn. I've read on htmlText and multiline, but I can't figure out how to simply attach a text to a button and, when the button is pressed, the htmlText is sent to the field.
var firstText = "";
firstText.multiline = true;
firstText.htmlText = "<p>test.</p>";
button1_btn.addEventListener(MouseEvent.CLICK, myInner);
function myInner (m:MouseEvent):void {
  myDynamic.htmlText = firstText;

Answer 1

That should be working, but for some reason it's not, so I'm guessing the problem lies with the textfield, because I tested the button by changing the function to gotoAndStop and it seems to be working, but only under some odd condition. I created the textfield manually, not with AS3, but that shouldn't make any difference, since I gave it an instance name. I work with scenes (not my choice) and I'm noticing some odd behavior, and I wonder if it may have anything to do with my problem.
For example, when I change the function to gotoAndStop (1, "del2"), the button, which is directed to del2 (part 2) will not work if you click on del3 (part 3) right away; however, if you click on del2 first, then on del3 again, and you click the button, then it's working. As for the textfield, it won't work either way; the only thing I've noticed is that if you go to del2 and back to del3, a mystical "e" appears. I wish I could explain myself better, so instead I invite you to check it out (it will only take you 20 seconds).
How to reproduce the 'error':
1. Go to http://studenter.miun.se/~stti1400/test2.swf;
2. Click on Del3;
3. Click on the yellow button in the upper left corner, under "1" (it doesn't work);
4. Now click on Del2;
5. Click on Del3;
6. Notice the "e"; now click the same button as before (it takes you to del2).
In case you want to check the fla-file: http://studenter.miun.se/~stti1400/test2.fla
I played around a bit, changing the text of the variable to something else, like "okokokokok"; the "e" doesn't appear then. I first thought the "e" was a fragment of the text, with the rest of the text not showing.