Setting width/height too early??

package {

 import flash.display.*;

 import flash.events.*;



 public class SimpleButtonDemo extends Sprite {

 public function SimpleButtonDemo( ) {

 // Create a simple button and configure its location

 var button:SimpleButton = new SimpleButton( );

 button.x = 20;

 button.y = 20;



//// ################# Added by me. Button won't show up any
more.

 button.width = 80;

 

 // Create the different states of the button, using the 

 // helper method to create different colors circles

 button.upState = createCircle( 0x00FF00, 15 );

 button.overState = createCircle( 0xFFFFFF, 16 );

 button.downState = createCircle( 0xCCCCCC, 15 );

 button.hitTestState = button.upState;

 

 // Add an event listener for the click event to be notified

 // when the user clicks the mouse on the button

 button.addEventListener( MouseEvent.CLICK, handleClick );

 

 // Finally, add the button to the display list

 addChild( button ); 



//// ############### This works, if added here!!!!

// button.width = 20;

 }

 

 // Helper function to create a circle shape with a given
color

 // and radius

 private function createCircle( color:uint, radius:Number
):Shape {

 var circle:Shape = new Shape( );

 circle.graphics.lineStyle( 1, 0x000000 );

 circle.graphics.beginFill( color );

 circle.graphics.drawCircle( 0, 0, radius );

 circle.graphics.endFill( );

 return circle;

 }

 

 // Event handler invoked whenever the user presses the
button

 private function handleClick( event:MouseEvent ):void {

 trace( "Mouse clicked on the button" ); 

 }

 }

}