Can't change child.x

Creating a child creates it at the x and y of the parent platform. When I try to change the onion.x it does not return an error but it also does not change the x.

The child class.

package {

  import flash.display.MovieClip;

  import flash.events.Event;

  import com.Platform

  public class Onion extends MovieClip {

  var onionSpeed;

  public function Onion(onionSpeed, pWidth) {

  this.addEventListener(Event.ENTER_FRAME, loop);

  this.x += pWidth;

  }

  function loop(e: Event): void {

  this.x -= onionSpeed;

}

}

}

The parent class.

package {

  import flash.events.Event

  import flash.display.MovieClip;

  public class Platform extends MovieClip {

  var platformSpeed;

  var platformWidth;

  public function Platform() {

  this.addEventListener(Event.ENTER_FRAME, loop)

  this.x = 1280;

  this.y = Math.floor(Math.random() * 550 + 200);

  this.platformSpeed = Math.random() * 8 + 6;

  this.platformCollision.width = (Math.random() * 400 + 200)

  platformWidth = this.platformCollision.width;

  if (Math.random() > 0.5) {

  var onion = new Onion(this.platformSpeed, this.platformWidth);

  this.platformContainer.addChild(onion);

  }

  }

  public function loop(e: Event): void {

  this.x -= platformSpeed;

  }

  public function removeSelf(): void {

  this.removeEventListener(Event.ENTER_FRAME, loop);

  this.parent.removeChild(this);

  }

  }

}

I tried

import com.Platform

in the onion class and using the platform.width but I got the error "1172: Definition com:Platform could not be found."