Positioning TextField around center x position? (Should be easy)

programming flash
1

Hi guys. This is probably a silly problem but when I create a textfield and use the centering property in the following way, I position it at x=0… but the middle of the text isn’t at zero; seemingly the left border of a large… area of some sort is at x=0.

var verdanaFont = new TextFormat();
            verdanaFont.font = 'Verdana';
            verdanaFont.size = 20;
            
                selections=new TextField();
                
                with (selections){
                    embedFonts = true;
                    defaultTextFormat = verdanaFont;
                    text='hello';
                    x=0; //or anything really
                    y=100;
                    autoSize = TextFieldAutoSize.CENTER;
                    
                }
                addChild(selections);

Is there something really silly I’m missing? :S