Basic problem with Classes/OO

[updownleftright]

Hi guys, sorry to be a total noob, but can someone please shed some light on why this works:
var path:String = "Resources//Graphics//Tiles/1.png";
var imageRequest:URLRequest = new URLRequest(path);
var picContainer:Loader = new Loader();
picContainer.load(imageRequest);
addChild(picContainer);

But this doesn't:
//action on frame 1
import Classes.Graphics.Tile
var myTile:Tile = new Tile();


//Tile.as in sub folder
package Classes.Graphics
{
public class Tile
{
public function Tile()
{
//The same code as above
trace("done");
}
}
}
I see the trace, so I know the function is working, so why no png? Sorry again if it's really stupid, but i'm a massive newboe when it comes to Object Oriented stuff!

[Flash Gordon]

public class Tile extends Sprite
.....
addChild(myTile);