Using listeners with dynamic textBoxes

flag._visible = false;
dynamicBox.onChanged = function(){
    flag._visible = true;
}

flag._visible = false;
var myListener:Object = new Object();
myListener.onChanged = function(){
    flag._visible = true;
}
dynamicBox.addListener(myListener);

var onChanged:Function = function(prop, _undefined_, newVal, obj){
    trace(prop + " changed from " + obj[prop] + " to " + newVal);
    return newVal;
}
one.watch("text", onChanged, one);

but.onPress = function(){
    one.text = 'Two';
}