API explorer does not show required feilds in the combinedContainer

What steps will reproduce the problem?
1. Any messages.Message inside a class with required fileds
class ProductFilter(messages.Message):
#This class is message received from client the response to which is the 
ManyProduct messages
    productCategory = messages.EnumField(EnumMessage.Category, 1, required=True)
    #productCategory  = Shoes, Bags, Apparel..
    productSubcategory = messages.EnumField(EnumMessage.SubCategory, 2, required=True)
    #productSubCategory = Boots, Sandals..
    productColor = messages.EnumField(EnumMessage.Color, 3, required=True)
    productSize = messages.EnumField(EnumMessage.Size, 4, required=True)
    productPriceBand = messages.EnumField(EnumMessage.PriceBand, 5, required=True)
2. FILTER_RESOURCE_CONTAINER = endpoints.ResourceContainer(
        ProductFilter,
        times=messages.IntegerField(2, variant=messages.Variant.INT32,
                                required=True))
3.@endpoints.method(FILTER_RESOURCE_CONTAINER, ManyProduct,
                      path='product/{times}', http_method='GET',
                      name='product.listProducts')

What is the expected output? What do you see instead?
The api explorer, should also show required fields in the GUI when the message 
is a class, currently it does not. So when I execute the get, the correct 
required fields are not captured resulting in a 400. 

Services > shopinaAPI API 1 > shopinaAPI.product.listProducts
Authorize requests using OAuth 2.0:

times   
    (integer)
{ALL THE OTHER REQUIRED FIELDS from ProductFilter ARE MISSING}

fields  

Selector specifying which fields to include in a partial response.
Use fields editor
bold red = required
Execute 

What version of the product are you using? On what operating system?
osx 

Please provide any additional information below.

Original issue reported on code.google.com by par...@reflect.ly on 7 May 2014 at 8:53

pombreda / google-apis-explorer

API explorer does not show required feilds in the combinedContainer #169