Flash :: Player Sprite Not Appearing?

My assignment is to create a real time (meaning using a game loop) Flash game in an object orientated manner. I've been following guides online, and I think I've got the basics down, but my player sprite isn't appearing.

I imported an image into Flash and then converted it into a symbol called Player, and now it's a movie clip. I exported it for ActionScript, and called the class com.Player.

Also, I have set the class of my document to com.Engine (this is where I plan to have my game loop and call methods to other classes).

Then, I created a directory called com in the same directory as my .fla. Inside that directory, I made Engine.as and Player.as, and here's the code for them both:

package com {
import flash.display.MovieClip;
import flash.display.Stage;

[Code].....

According to what I know, that should make the player appear in the center of the screen when I run it, but it doesn't. I've verified that the Engine class and constructor is being called using trace("hello world"), and I get that output. I also know that the constructor for the Player class is being called by using the same method. I just don't get why the player doesn't appear on screen.

If I drag the Player symbol (correct terminology?) from my library onto the stage, the player sprite shows up... so I know there's an image attached.