Display Data From KML Files on info window using google maps API -

im pretty new kml. have kmlfile containing bunch of (approx. 35 polygon) addresses.

this kml files :

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i want show value of simple data on infowindow:

<simpledata name="commune">el-jadida (m)</simpledata> 

i tried code :

google.maps.event.addlistener(ctalayer, 'click', function(kmlevent) {     showincontentwindow(kmlevent.latlng, kmlevent.featuredata.commune);       }); 

it doesn't work,i show infowindow value undefined after see on https://developers.google.com/kml/documentation/kmlelementsinmaps

that simpledata not supported on googlemaps

i tried add code after each closing tag extendeddata :

<description>commune</description> 

but doesn't work

does know better solution displaye feature data kml file on infowindow ?