MetadataEntityListener childListener = (MetadataEntityListener) eventManager.getEntityEventListener();
DescriptorEventListener entityEventListener = ((DescriptorEventManager) entityEventManagers.get(index)).getEntityEventListener();
MetadataEntityListener childListener = (MetadataEntityListener) eventManager.getEntityEventListener();
DescriptorEventListener entityEventListener = ((DescriptorEventManager) entityEventManagers.get(index)).getEntityEventListener();