Animated duplication of a button?

Hi everybody,

I have the code below, and it works nicely duplicating a movieclip from the library. But, all the duplicated apppear at the same time…how could I make them appear one at the time?

Thank you very much for your help.

var xStart:Number = 10;
var yStart:Number = 10;
var distance:Number = 30;
var v:Number = 0;
var i:Number = -1;
while (++i < 10) {
var j:Number = -1;
while (++j < 10) {
v++;
var name:String = “holder” + v + “_mc”;
_root.createEmptyMovieClip(name, v);
_root[name]._x = xStart + i * distance;
_root[name]._y = yStart + j * distance;
_root[name].attachMovie(“myBtn”, “button_mc” + v, v);
}
}