Variable addChild is not defined?

Question

Hi, i have a problem using AS3 - Flash CS3 gives me this Error message: Error #1065: Variable addChild is not defined.

Any ideas what's wrong?

This is my code:

package coa.application{
    import flash.display.SimpleButton;
    import flash.text.TextField;
    import flash.text.TextFieldType;

    public class Tab extends SimpleButton {

     public var menuType:String;

     public function Tab(tabText:String, menuType:String) {
      this.menuType=menuType;
      var mytext:TextField=createTextField(0,0,200,20);
      mytext.text=tabText;
     }
     private function createTextField(x:Number, y:Number, width:Number, height:Number):TextField {
      var result:TextField = new TextField();
      result.x=x;
      result.y=y;
      result.width=width;
      result.height=height;
      addChild(result);
      return result;
     }
    }    
}

Answer 1

It's because SimpleButton does not inherit from DisplayObjectContainer but from InteractiveObject.

addChild is a mehtod from DisplayObjectContainer. SimpleButton contains 3 displayobject for the 3 states and the hittest object, they are named upState, overState, downState and hitTestState.

So you should be able to set one of them.

//addChild(result);
upState = result;

You could just add a DisplayObjectContainer (like a Sprite) to the states and then add the TextField there instead, in case you want to add more graphics to the states.

upState = new Sprite();
upState.addChild(new MyButtonBackground()); //Make this class.
upState.addChild(result);