     null
 
   # Public: Sorts objects.
+  #
   # cb - compare callback function
   sort: (cb) ->
     @_objects.sort.apply(@_objects, arguments)

    super(x, y, w, h)
    @_objects = []

  # Public: Iterates over each object.
  # cb - iteration callback function
  each: (cb) ->
    for o in @_objects

    null

  # Public: Iterates over each object of a given class.
  #
  # klass - a class
  # cb - iteration callback function
  eachByClass: (klass, cb) ->
    for o in @_objects
      if o instanceof klass and cb(o) is false
