gmaps4rails v2 - insert infoWindow close button INTO the infowindow - google-maps

Question

I'm using gmaps4rails to display markers on a google map.
It's working well but i can't figure out how to remove the default close button for the infowindows and insert it INTO the infowindow with the customizations of my choice.
index.html.erb:
<div class='full_height' style='width: auto;'>
<div id="map" class='full_height' style='width: 100%;'></div>
</div>
<script type="text/javascript">
$(document).ready(function(){
var raw_markers = <%=raw #hash.to_json %>;
function createSidebarLi(json){
return ("<li>" + json.titre + ' ' + json.address + "</li>");
};
function bindLiToMarker($li, marker){
$li.on('click', function(){
handler.getMap().setZoom(14);
marker.setMap(handler.getMap()); //because clusterer removes map property from marker
marker.panTo();
google.maps.event.trigger(marker.getServiceObject(), 'click');
});
};
function createSidebar(json_array){
_.each(json_array, function(json){
var $li = $( createSidebarLi(json) );
$li.appendTo('#markers_list');
bindLiToMarker($li, json.marker);
});
};
handler = Gmaps.build('Google', { builders: { Marker: InfoBoxBuilder} });
handler.buildMap({ internal: {id: 'map'}}, function(){
var markers = handler.addMarkers(raw_markers);
_.each(raw_markers, function(json, index){
var marker = markers[index];
json.marker = marker;
google.maps.event.addListener(handler.getMap(), "click", function(){
infoWindow.close();
});
google.maps.event.addListener(marker.getServiceObject(), 'mouseover', function(){
google.maps.event.trigger(marker.getServiceObject(), 'click');
});
});
createSidebar(raw_markers);
handler.bounds.extendWith(markers);
handler.fitMapToBounds();
});
});
</script>
infoboxBuilder.js.coffee:
class #InfoBoxBuilder extends Gmaps.Google.Builders.Marker # inherit from base builder
# override method
create_infowindow: ->
return null unless _.isString #args.infowindow
boxText = document.createElement("div")
boxText.setAttribute("class", 'yellow') #to customize
boxText.innerHTML = #args.infowindow
#infowindow = new InfoBox(#infobox(boxText))
infobox: (boxText)->
content: boxText
pixelOffset: new google.maps.Size(0, -20)
boxStyle:
width: "280px"
controller:
def index
if params[:search].present?
#properties = Property.near(params[:search], 100, )
else
#properties = Property.all
end
#hash = Gmaps4rails.build_markers(#properties) do |property, marker|
#sameLocation = #properties.near(property)
marker.lat property.latitude
marker.lng property.longitude
marker.infowindow render_to_string(:partial => "/properties/infowindow", :locals => { :property => property})
marker.json({ titre: property.titre, address: property.address})
#marker.picture({
# :url => 'http://198.100.149.26/lookn/marker.png',
# :width => 60,
# :height => 82
#})
end
end