S/he said that s/he would try your suggestion later because of no time today. Then s/he will reply.

so u de su ga

P.S. In your code, the class "btn" should be defined as a dynamic one, otherwise the public property "id" should be declared, shouldn't it?

yes ,btn extends from MovieClip ,so it's not a static class
the public property "id" not be declared will be ok
p.s. (my poor English)

if the btn is in stage already(draged into stage from lib)
and has instance name ...like.. btn1..btn2..btnx
we can use "getChildByName()"


for(var i:int = 1; i<=30; i++ ){
var _mc=stage.getChildByName("btn"+i) as MovieClip
_mc.addEventListener(MouseEvent.MOUSE_UP, myFunc);
}

function myFunc(e:MouseEvent):void{
var namestr:String = e.target.name;
var id:String = (namestr.length < 5) ? namestr.substr(3,1) : namestr.substr(3,2);
trace(id);
}