Show constant properties of enumeration class in autocomplete

I am using MATLAB Version R2015b. I have an enumeration class as follows:

    classdef EnumClass
      enumeration
        E1 ('E1'),
        E2 ('E2')
      end
      methods
        function object = EnumClass(arg1)
          object.FAUX_CONST_PROP = ['This property relates to ' arg1];
        end
      end
      properties(Constant = true)
        FAUX_CONST_PROP = 'test_value';
      end
    end

Accessing the FAUX_CONST_PROP works as desired, however I can not get an autocomplete to work unless I set a separate variable to one of my enum values

    >> EnumClass.E2.FAUX_CONST_PROP   (autocomplete does not work)
    >> tempVar = EnumClass.E2;
    >> tempVar.FAUX_CONST_PROP        (autocomplete works)

My question is why must I set my enum to a temporary value to get the list of immutable properties?