I suggest always using a variable (if applicable) to your attachMovie() method..

it makes it easier to reference it and add actions to it..

ie:
actionscript Code:
var newClip = targetClip.attachMovie("linkage-name", "linkage-name"+target.getNextHighestDepth(), target.getNextHighestDepth());
//place new clip on stage
newClip._x = Math.random(Stage.width);
newClip._y = Math.random(Stage.height);
//add button events
newClip.onPresss = function(){
    trace("My Name Is: "+this._name);
}