Add and Remove KML overlay to a Google Map from external link -

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i'm trying emulate functionality

https://maps.google.com/maps?q=http://en.wikipedia.org/w/index.php%3ftitle%3dtemplate:attached_kml/n_postcode_area%26action%3draw

i want able add , remove postcode region external link / checkbox. have kml file loading correctly using code have no idea how attach external event listener / handler. 

function initialize() {   var london = new google.maps.latlng(51.522416,-0.11673);   var mapoptions = {     zoom: 11,     center: london,     maptypeid: google.maps.maptypeid.roadmap   }    var map = new google.maps.map(document.getelementbyid('map-canvas'), mapoptions);    var ctalayer = new google.maps.kmllayer({     url: 'path/to/kml',     suppressinfowindows: true   });   ctalayer.setmap(map);  }  google.maps.event.adddomlistener(window, 'load', initialize);

i've tried looking in ctalayer object individual nodes kml file dont seem there.


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