切换KML层，信息窗口不起作用

我有这段代码，我正在尝试切换一些kml层。问题是，当我点击标记时，它不会显示信息窗口。

也许有人能告诉我我的错误。

这是代码：

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
      html { height: 100% }
      body { height: 100%; margin: 0; padding: 0 }
      #map_canvas { height: 100% }
    </style>
    <script type="text/javascript"
      src="http://maps.googleapis.com/maps/api/js?key=IzaSyAvj6XNNPO8YPFbkVR8KcTl5LK1ByRHG1E&sensor=false">
    </script>
    <script type="text/javascript">
var map;
// lets define some vars to make things easier later
var kml = {
    a: {
        name: "Productores",
        url: "https://maps.google.hn/maps/ms?authuser=0&vps=2&hl=es&ie=UTF8&msa=0&output=kml&msid=200984447026903306654.0004c934a224eca7c3ad4"
    }
// keep adding more if you like 
};
// initialize our goo
function initializeMap() {
    var options = {
        center: new google.maps.LatLng(13.324182,-87.080071),
        zoom: 8,
        mapTypeId: google.maps.MapTypeId.TERRAIN
    }
    map = new google.maps.Map(document.getElementById("map_canvas"), options);
    createTogglers();
};

google.maps.event.addDomListener(window, 'load', initializeMap);

// the important function... kml[id].xxxxx refers back to the top 
function toggleKML(checked, id) {

 if (checked) {
        var layer = new google.maps.KmlLayer(kml[id].url, {
            preserveViewport: true,
            suppressInfoWindows: true 
        });
        // store kml as obj
        kml[id].obj = layer;
        kml[id].obj.setMap(map);
    }
    else {
        kml[id].obj.setMap(null);
        delete kml[id].obj;
    }
};
// create the controls dynamically because it's easier, really
function createTogglers() {
    var html = "<form><ul>";
    for (var prop in kml) {
        html += "<li id="selector-" + prop + ""><input type='checkbox' id='" + prop + "'" +
        " onclick='highlight(this,"selector-" + prop + ""); toggleKML(this.checked, this.id)' />" +
        kml[prop].name + "</li>";
    }
    html += "<li class='control'><a href='#' onclick='removeAll();return false;'>" +
    "Remove all layers</a></li>" + 
    "</ul></form>";
    document.getElementById("toggle_box").innerHTML = html;
};

function removeAll() {
    for (var prop in kml) {
        if (kml[prop].obj) {
            kml[prop].obj.setMap(null);
            delete kml[prop].obj;
        }
    }
};

// Append Class on Select
function highlight(box, listitem) {
    var selected = 'selected';
    var normal = 'normal';
    document.getElementById(listitem).className = (box.checked ? selected: normal);
};
</script>
<style type="text/css">
.selected { font-weight: bold; }
</style>
</head>
<body>
<div id="map_canvas" style="width: 50%; height: 200px;"></div>
<div id="toggle_box" style="position: absolute; top: 200px; right: 1000px; padding: 20px; background: #fff; z-index: 5; "></div>
</body>
</html>

KmlLayer构造函数中KmlLayerOptions中的"suppressInfoWindows:true"会导致信息窗口被抑制。

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