GMap - Marker Selection Overlays can be selected via ajax behaviors.
<h:form>
    <p:growl id="growl" showDetail="true" />

    <p:gmap id="gmap" center="36.890257,30.707417" zoom="13" type="HYBRID" model="#{markerSelectionView.simpleModel}"  style="width:100%;height:400px">
        <p:ajax event="overlaySelect" listener="#{markerSelectionView.onMarkerSelect}" update="growl" />
    </p:gmap>
</h:form>
                
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