code: private static ImageDescriptor createUnManagedCached(String prefix,
  			String name)
  	{
  		return new CachedImageDescriptor(create(prefix, name, true));
  	}
docs: /*
  Creates an image descriptor for the given prefix and name in the JDT UI bundle and let tye descriptor cache the
  image data. If no image could be found, the 'missing image descriptor' is returned.