[saikspaik]

Примерно так:

var n : Number = 0;
var arr : Array = [];
for (var i = 0; i < 10; i ++)
{
	arr [i] = [];
	for (var j = 0; j < 10; j ++)
	{
		var b : MovieClip = new box ();
		addChild (b);
		arr [i][j] = b;
		arr [i][j].x = i * 20;
		arr [i][j].y = j * 20;
	}
}