SimpleMarker class just got an update. As someone pointed out that the
MarkerManager from the Google Maps Utility Library needs a
setVisible() method from its markers, I have added this particular method. Now it is compatible to the Manager and can be used in situations where you need lightweight markers and clustering or other marker management.
Update: I've uploaded a second update. From now on the bounds which are calculated with
SimpleMarker.getBounds() will be cached in an array. This improves the performance for my
SimpleCluster class to which an article will follow in the next days.