[Google Maps API v2] KMZ issue

I am not able to refresh kmz file.

If i edit the kmz file its refreshing.
If i delete the existing file and create new kmz file, its not
refreshing.

I am using networklinks.

function addKmlFromUrl(kmlUrl) {
var link = ge.createLink('');
link.setHref(kmlUrl);
var networkLink = ge.createNetworkLink('');
networkLink.set(link,true,false);
ge.getFeatures().appendChild(networkLink);
}
Thanks
Ajit

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