Error 1120 Access of undefined property....

Question

I recently completed an Adobe video tutorial that showed me
how to create a simple application using components: 
simple
application

I'm trying to learn about document classes and how to use
external .as files to control the movie, and so I figured this
might be a good example to try using. However, I keep getting
Compiler error 1120 on lines 
11–4 (Access of undefined property dp); 
16 (Access of undefined property myList and dp); 
18 (Access of undefined property myList and announceSelect);

19 (Access of undefined property myButton and eatItem); and 
22, 25, 26 (Access of undefined property myList). I looked
at other 1120 problems on the forum and it seems like most of them
are labeling-related, and from what I can tell, my labels are okay.
Any help would be much appreciated!

The flash file consists of a list with the name myList and a
button with the name myButton. The code from the .as file is as
follows:

Newsgroup_User · Answer

Move all the initialization stuff into a constructor or method called by the
constructor. i.e.

public class Eating extends MovieClip {

var dp:DataProvider = new DataProvider();

//constructor
public function Eating ()
{
dp.addItem( { label: "tomato" } );
dp.addItem( { label: "carrot" } );
dp.addItem( { label: "blueberry" } );
dp.addItem( { label: "turnip" } );

myList.dataProvider = dp;
myList.addEventListener(Event.CHANGE, announceSelect);
myButton.addEventListener(MouseEvent.CLICK, eatItem);
}

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