             @units.trigger 'batch-remove',
                 removed: units
 
-        addService: (service) ->
+        _addService: (service) ->
             if @services.isEmpty()
                 # Remove possible units
                 # that had been added through

                        @units.trigger 'finished'

            unit_list.fetch opts

        removeService: (service_id) ->
            service = @services.get(service_id)

                # selection.
                @units.reset []
                @search_results.set []

            ancestor = @services.find (s) ->
                s.id in service.get('ancestors')
            if ancestor?
                @removeService(ancestor)
            @services.add(service)

            unit_list = new models.UnitList pageSize: PAGE_SIZE
