addChild from an external .as file

programming flash
1

Hello Everyone,
I was trying to add a TextField to the stage from an external class. I’ve made a small example of the part that isn’t working for me.

The basic idea of the external class:

package {
	import flash.display.Sprite;
	import flash.text.TextField;
	public class Text extends Sprite {
		public function Text():void {
			var txt:TextField = new TextField();
			txt.x = 0;
			txt.y = 0;
			txt.text = "this is a text test" ;
			addChild( txt );
		}
	}
}

The timeline code:

import Text;
var a:Text = new Text();

When I run this I don’t get any errors, but the text still doesn’t show on the stage.
Thanks for any help.