Dynamic Text Field Size by actionscript

Hi …i have a problem that’s driving me crazy.
I have a dynamic text box, with font size 160 and College font. (everything’s embedded bla bla bla :D)
I’m building a little application that with the press of a button you change the font in the dynamic field.

var collegeNum:TextFormat = new TextFormat();
//collegeNum.bold = true;
collegeNum.size = 160
collegeNum.font = "College";
font4.onRelease = function() {
    txt2.setTextFormat(collegeNum);
};

The field (txt2) is already filled with a number…now if I press the button IT SHOULD STAY EXACTLY THE SAME as I’m giving the same font size by code as the field…but it doesn’t, it gets smaller…like if there was a limit to it, and even if I put 500 as the size it still gets smaller sticking to that mysterious limit :mad:

any clues? :o

ps: if you use smaller font size values it works fine, but it seems like that i stops at 100px when i give it in by code.