Formatting a TextField object is different than formatting a TextArea object in AS3. Below is an example main project class that formats a text field in AS3.

 Javascript | 
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package  {
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	import flash.display.MovieClip;
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	import flash.text.TextField;
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    import flash.text.TextFieldAutoSize;
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    import flash.text.TextFormat;
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	public class main extends MovieClip {
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		//create vars
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		//create text field object
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		var myTextField:TextField = new TextField();
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		//create text field formatting style variable
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		var myTextFormat:TextFormat = new TextFormat();
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		//Note: text muse be added after the TextFormat instances is assigned to else the fomatting won't apply.
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		public function main() {
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			// constructor code
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			addChild(myTextField);
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			myTextField.x = 30;
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			myTextField.y = 30;
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			myTextField.width = 250;
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			myTextField.height = 100;
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			//myTextField.text = "Hello World";
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			//set style formating variable
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			myTextFormat.font = "Arial";
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			myTextFormat.size = 40;
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			myTextFormat.bold = true;
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			myTextFormat.italic = true;
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			myTextFormat.underline = true;
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			myTextFormat.color = 0xef0000;
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			//apply style to textField variable
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			myTextField.defaultTextFormat = myTextFormat;
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			myTextField.text = "Hello World";
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		}
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	}
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}
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Here is another example on how to format a TextField, and the text in the TextField, from Adobe's website.