createEmptyMovieClip and duplicateMovieClip???

[deeno]

hi there!

i've posted this question several times
on flashMX-forum but not one person answered!!!

is it that difficult?

try it please:

trying to figure out why this happens...
i am creating an empty movieclip [c0], then
inside that clip another movieclip [fill] and
then i am trying to duplicate the initial
clip [c0] (which contains [fill]) but it only
duplicates [c0] without the content [fill]...

makes me crazy!!!
why does it happen?
any idea? help?

here is the code:
all you need to do in order to test it
is copying into an empty frame, no lib etc. needed
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radius = 50;
outline = 0;

function create() {
    _root.createEmptyMovieClip("c0", 1);
    c0.createEmptyMovieClip("fill", 2);
    with (c0.fill) {
        var a = radius;
        var b = radius;
        var j = a*0.70711;
        var n = b*0.70711;
        var i = j-(b-n)*a/b;
        var m = n-(a-j)*b/a;
        var x = Stage.width/2;
        var y = Stage.height/2;
        //lineStyle(outline, 0x000000, 100);
        beginFill(0xff0000, 100);
        moveTo(x+a, y);
        curveTo(x+a, y-m, x+j, y-n);
        curveTo(x+i, y-b, x, y-b);
        curveTo(x-i, y-b, x-j, y-n);
        curveTo(x-a, y-m, x-a, y);
        curveTo(x-a, y+m, x-j, y+n);
        curveTo(x-i, y+b, x, y+b);
        curveTo(x+i, y+b, x+j, y+n);
        curveTo(x+a, y+m, x+a, y);
    }
}

create();

duplicateMovieClip("c0", "c1", 3);

trace ("c0._x: " + c0._x);
trace ("c0._h: " + c0._height);

trace ("c1._x: " + c1._x);
trace ("c1._h: " + c1._height);

stop();

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thanx in advance!!!
deeno