Prototype/attachMovie problem

1

Im new to prototypes…
im using attachMovie to generate some buttons. And setting the prototype when it is created.
Problem is when I call the prototype (which just traces the instance name) it always traces the last instance created. None of the others.

in the first frame the code is this…

feedback.text += "FEEDBACK: 
";

for (n = 1; n<8; n++) {
    // mt is an emptyclip
    clip = mt.attachMovie("b", "b"+n, mt.getNextHighestDepth());

    yoffset = clip._height*n;
    clip._y = yoffset;

    clip.txt.text = "b" + n; // name on button

    clip.onRelease = function() {
        clip.myProto();
    };
}

MovieClip.prototype.myProto = function() {
    // trace instance name
    feedback.text += this._name+"
";
};

any help would be much appreciated :beer:

EDIT::: Im using Flash MX 2004