This object is interested in contacting a LayerHandler to find out all the layers available, and optionally, a LayersPanel in order to provide a menu item that will call up the GUI for the LayersPanel. If this LayersMenu is a member of a BeanContext, it expects that only one of each of these objects will be added, but if more than one per type is added, the last one added to be BeanContext will be the one hooked up to this LayersMenu.
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