Custom control that's not shown - google-maps-api-3

Question

I'm porting a v2 to v3 app map and there's one thing I can't get to work.
I have a custom control that is not shown, anything.
I'm not sure where is the problem so I'll post everything i think is relevant, ask for some more if needed
Here's the constructor:
Note that there's still the comments from v2
function Semaforo(){}
//Semaforo.prototype = new GControl();
Semaforo.prototype.semaforo = document.createElement("img");
Semaforo.prototype.initialize = function(map) {
var container = document.createElement("div");
var semaforoDiv = document.createElement("img");
semaforoDiv.setAttribute("class", "semaforo");
this.setButtonStyle_(semaforoDiv);
this.semaforo = semaforoDiv;
container.appendChild(semaforoDiv);
semaforoDiv.setAttribute("src", "img/semaforo_rojo.png");
map.getContainer().appendChild(container);
return container;
}
And some of the methods:
Semaforo.prototype.setColor = function(color, mapa) {
this.semaforo.setAttribute("src", "img/semaforo_" + color + ".png");
if(color == "rojo")
{
this.semaforo.setAttribute("alt", "Tr�fico dif�cil");
this.semaforo.setAttribute("title", "Tr�fico dif�cil");
}
else if(color == "ambar")
{
this.semaforo.setAttribute("alt", "Tr�fico irregular");
this.semaforo.setAttribute("title", "Tr�fico irregular");
}
else
{
this.semaforo.setAttribute("alt", "Tr�fico fluido");
this.semaforo.setAttribute("title", "Tr�fico fluido");
}
}
Semaforo.prototype.getDefaultPosition = function() {
return new google.maps.ControlPosition.TOP_RIGHT;
//return new GControlPosition(G_ANCHOR_TOP_RIGHT, new GSize(0, 0)); //TO DO
}
Semaforo.prototype.setButtonStyle_ = function(button) {
button.style.width = "19px";
button.style.height = "53px";
button.style.cursor = "default";
}
function getIconoSemaforo(color, mapa){
var semaforo = new Semaforo();
semaforo.setColor(color, mapa);
return semaforo;
}
Here is where I call the constructor and try to make/show the control
function incluirDatosXML()
{
for (var i=0; i<ciudadDato.length; i++)
{
if (i==0)
{
if (semaforoDato[i]!="no")
{
var semaforo = new Semaforo(this.semaforo, map[1]);
map[1].controls[google.maps.ControlPosition.TOP_RIGHT].push(this.semaforo);
//map[1].addControl(semaforo);
semaforo.setColor(semaforoDato[i], map[1]);
/*google.maps.event.addListener(map[1], 'idle', function() {
map[1].controls[google.maps.ControlPosition.TOP_RIGHT].push(this.semaforo);
});*/
}
}
if (i==1)
{
if (semaforoDato[i]!="no")
{
var semaforo = new Semaforo(this.semaforo, map[2]);
//map[2].addControl(semaforo);
semaforo.setColor(semaforoDato[i], map[2]);
//map[2].controls[google.maps.ControlPoistion.TOP_RIGHT].push(this.semaforo);
}
}
if (i==2)
{
if (semaforoDato[i]!="no")
{
var semaforo = new Semaforo(this.semaforo, map[3]);
//map[3].addControl(semaforo);
semaforo.setColor(semaforoDato[i], map[3]);
//map[3].controls[google.maps.ControlPoistion.TOP_RIGHT].push(this.semaforo);
}
}
$("#clima"+(i+1)).attr("class",climaDato[i]+"_mini");
$("#temp"+(i+1)).html(temperaturadDato[i]+"°");
}
}
So all you can see there is what i tested so far even there's still some comments from previous testings