Expanding text box issue

Hello,I have a box called infoBox that contains a text field called caption. infoBox expands on mouse-over. When it does so, I do not want the text in caption to scale up - I want it to stay at 11 pt. So far my code to prevent this from happening is not working:How do I fix this?

	caption.autoSize = TextFieldAutoSize.NONE; //keep the text from stretching with the box	

caption is a child of infoBox.