If developers wish to use other geocoders other than the USAddressGeocoder
and IntlAddressGeocoder, they should override this method to call
the geocoder of their choice.
This method geocodes all the traffic events within the specified radius of the
longitude and latitude provided, and populates them as TrafficEventBeans.
Returns the ISO compliant 2-digit country code used when creating this marker, or null if this point was
created using an IP or longitude/latitude pair.
GoogleMapClusterTag
This tag represents a <googlemaps:cluster> tag and allows developers to groups
icons together into clusters, that expand as the user zooms in on them.