Changing a document class to an imported class

Question

Hello everybody!
My following document class is working fine. But, when I want to import it instead of using as a document class, it reports an error "1067: Implicit coercion of a value of type Class to an unrelated type flash.display:DisplayObject.". My class code is here:
package
import flash.display.Sprite;
import flash.display.Shape;
import flash.text.TextField;
import flash.events.MouseEvent;
public class Shapes extends Sprite
  var square: Sprite = new Sprite();
  var txt: TextField = new TextField();
  public function Shapes()
   square.graphics.lineStyle(4, 0xFF66CC);
   square.graphics.beginFill(0x990066);
   square.graphics.drawRect(250, 35, 175, 175);
   square.graphics.endFill();
   square.buttonMode = true;
   addChild(square);
   square.addEventListener(MouseEvent.CLICK, clickHandler);
   txt.text = "A Child of the Square";
   square.addChild(txt);
  function clickHandler(ev: MouseEvent): void
   if (square.numChildren > 0)
    square.removeChild(txt);
My FLA file script is as below:
import Shapes;
addChild(Shapes);
Seeking help, please!

Answer 1

You need to create an instance of the class Shapes and tha add this isntance
i.e. something like this
var shapes: Shapes = new Shapes();
addChild( shapes );