carto - Unable to make infowindow work in CartoDB runtime layer

I'm trying to personalize a layer created with CartoDB. The layer is created at runtime and the problem is that I cannot make work even easy things like custom infowindow or legends or click interactions. No errors shown in the js console.

I tried with other layers (the ones used with the CartoDB tutorial) and those are working. What it's wrong with mine?

Here's the code I'm using:

function main() {
      var map;
      var urbino = new google.maps.LatLng(43.7292108173, 12.6530746836);
      var mapOptions = {
        zoom: 15,
        center: urbino,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      };
      map = new google.maps.Map(document.getElementById('map'),  mapOptions);
  cartodb.createLayer(map, {

    user_name: 'my_user',
    type: 'cartodb',
    infowindow: true,
    legends: true,
    sublayers: [{
      sql: "SELECT * FROM raw_output",
      cartocss: '#raw_output { marker-opacity: 0.9;}'
      }]
})
.addTo(map)

.on('done', function(layer) {
   var sublayer = layer.getSubLayer(0);

   sublayer.infowindow.set('template', $('#infowindow_template').html());

   sublayer.on('featureClick', function(e, pos, latlng, data) {
      alert("Hey! You clicked " + data.cartodb_id);
    });
  }).on('error', function() {
    console.log("some error occurred");

  }); 

}

Seems that using runtime layers is not that flexible as using predefined visualizations with the UI...Am I wrong?