title: Google MarkerClusterer - change icons dynamically
body: <p>Is it possible to change cluster icons dynamically? The criteria is not the amount of markers in the cluster, but some given values for the data inside the cluster. And I need to update the icons each 10 seconds depending on those data. I havent found any samples for this I am wondering whether its possible or not. I tried following but it dosent have any effect:</p>
  
  <pre><code>$.each(global.markersCluster.clusters_, function (index, cluster) {
     cluster.clusterIcon_.index_ = 2;
     cluster.clusterIcon_.url_ = '';
  
     var eee = '';
  });
  </code></pre>