         children: controller
       })
     ))
-  .property('content', 'sortProperties.@each', 'subArrays.@each')
+  .property('content', 'sortProperties.@each', 'needs.@each', 'subArrays.@each')
 
   ###
     Assembles array of objects contained in this mixed array controller and all


    flatten arrangedContent

  ###
    @private


    @chainable
  ###
  _subArraysDidChange: Ember.observer ->
    get(@, 'needs').addObjects(Ember.A(get(@, 'subArrays')))
    @
  , 'subArrays', 'subArrays.@each'
