MarkerCluster with polygon problem.

If I have my map with polygons and MarkerCluster the clusters can be
clicked and expanded.

example without polygons that the clusters can be clicked
http://jim.hollenback.org/SandBox/V2/MapCaches.html?title=header1&maptitle=header2&file=XmlFile/StateMaps/Washington.xml&type=area

but if I include polygons I can't click the clusters to expand them.

example with polygons and clusters
http://jim.hollenback.org/SandBox/V2/MapCaches.html?title=header1&maptitle=header2&file=XmlFile/StateMaps/Washington.xml&type=poly&polyfile=polygons/Washingtoncounty.xml

Is there a way to get these two to play together?

Jim

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