Scrollbars in textfields

programming flash
1

Hi, I am trying to work out how exactly to add a scroll bar to the following textfield… I have a deadline to meet very very soon, any assistance now is greatly appreciated.

var bio:String = evt.artistInfo.bio.summary;					var bioFormat : TextFormat = new TextFormat("Century Gothic", 12, 0x336699, false, false, false, null, null, TextFormatAlign.LEFT, 10, 10, 0, null);
					bioFormat.align = "justify";
					bioField.defaultTextFormat = bioFormat;
					bioField.width = 215;
					bioField.height = 250;
					bioField.x = 60;
					bioField.y = 250;
					bioField.multiline = true; 
           			bioField.wordWrap = true; 
					bioField.htmlText = bio;
					bioField.blendMode = BlendMode.LAYER;
					bioField.alpha = 1;
					addChild(bioField);