Extending and MovieClip?

Question

This is really aggravating me. I come from a OOP background
so Java and others are natural to me but ActionScript 2 is really
really unintuitive even thought it tries really hard to be a object
oriented language. So sorry if some of my question comes off as
rant/frustration.
I'm trying to extend the MovieClip class but it seems "class
Test extends MovieClip" isn't actually a MovieClip!!! wtf
[code]
class Test extends MovieClip {
function Test(){
trace("constructor called");
lineStyle(5, 0xFF00FF, 100);
moveTo(200, 200);
lineTo(300, 300);
lineTo(100, 300);
lineTo(200, 200);
On frame 1:
import Test;
stop();
var myMc = new Test();
[/code]
It outputs constructor called, but it doesn't draw anything
and in true Actionscript fashion, outputs no errors or warnings
whatsoever.
It seems that a class that extends a MovieClip isn't actually
a MovieClip. So much for that "is-a" relationship that its supposed
to have. or i guess it gives you access to the MovieClip functions,
but theres no point because theres no MovieClip on the stage...
Sure I suppose I could create an empty movie clip in the
constructor and put things in there, but then whats the point of
extending MovieClip? If Test really is a MovieClip it should be
able to draw on itself.
What am I not getting???

Answer 1

Yes, I believe its more like you're used to in as3.
So in as2 extending a MovieClip is not "as it should be". But
its not too difficult to get used to. If you're just starting with
actionscript coming from another OOP language you may want to start
with as3.
If you're doing it in as2 then cast the return type of
attachMovie to your class.
var mynewThing:Thing = attachMovie("thingClip", "firstThing",
nextdepth)
There are some 'tricks' to avoid using a library symbol:
"an empty movie clip is automatically created for your class
in your library with the linkage id __Packages.[full class name].
So you could just use that without defining any symbols yourself."
-source:
http://board.flashkit.com/board/showthread.php?t=615810
example: