Cannot see the content inside of a MovieClip - actionscript-3

Question

I don't know why this is happening. What I want to do is easy: Create a container and then add a grid of squares in order to build a trivia:
private var square:MovieClip = new MovieClip();
square.width = 308;
square.height = 400;
square.x = 48;
square.y = 223;
square.name = "square";
addChild(square);
private function generarGrilla():void {
var cant = 36;
var col:Number = 5;
var yCounter:Number = -4;
var xCounter:Number = 4;
var sY:Number = 10;
var sX:Number = 10;
for (var j = 1; j < cant; j++) {
var caja:clip = new clip();
caja.name = "opcion" + j;
caja.x = 20 + caja.width * j * 1.2;
caja.y = 20 + caja.height * j * 1.2;;
// caja.x = (sX + caja.width) * xCounter ;
// caja.y = (sY + caja.height) * yCounter;
caja.addEventListener(MouseEvent.CLICK, seleccionarOpcion);
caja.buttonMode = true;
caja.mouseChildren = false;
var contentText = new TextField();
var formato = new TextFormat();
formato.size = 14;
contentText.defaultTextFormat = formato;
contentText.width = 36;
contentText.height = 34;
contentText.x = -10;
contentText.y = -10;
for(var u:uint = 0; u < cant; u++){
contentText.text = "" + u;
}
square.addChild(caja);
caja.addChild(contentText);
}
var barra:score = new score();
barra.x = 80;
barra.y = -200;
barra.puntajeTXT.text = "hola";
addChild(barra);
barra.botonSalir.buttonMode = true;
barra.botonSalir.addEventListener(MouseEvent.CLICK, salirJuego);
}
The square movieclip is placed on the stage without any problem, but I cannot see the grid...