Changing text size for dynamic text

[winfreebot]

Hey guys,

So I've got some dynamic text that I want to concatenate some text onto. Sometimes, however, I want to change the font size of that text. At the moment my code looks something like this but it doesn't work; even if "anotherCondition" is met, the text (unfortunately) does not change:

Any ideas? Thanks! (I'll post my actual code if needed, but it's a mess and will need some cleaning up for readbility...happy to do so though if preferred)

myTextFormat = new TextFormat();
myTextFormat.size = 10;
myTextFormat.bold = true;

while(someCondition)
{

    if (anotherCondition)
    {
	myTextFormat.size = 14;
    }

    accumulatingText.setNewTextFormat(myTextFormat);
    accumulatingText.text += newText + newline;

}

[Sunny13]

place a text box names box_txt on stage and write this code at the first frame of the maintime line .. (the code is from the flash help)

PHP Code:

var format1_fmt:TextFormat = new TextFormat();
format1_fmt.font = "Arial";
var format2_fmt:TextFormat = new TextFormat();
format2_fmt.font = "Courier";
var string1:String = "Sample string number one."+newline;
var string2:String = "Sample string number two."+newline;
box_txt.multiline = true;
box_txt.wordWrap = true;
box_txt.text = string1;
var firstIndex:Number = box_txt.length;
box_txt.text += string2;
var secondIndex:Number = box_txt.length;
box_txt.setTextFormat(0, firstIndex, format1_fmt);
box_txt.setTextFormat(firstIndex, secondIndex, format2_fmt);