GROUP BY WITH CUBE Issue

I am having a problem with a query in SQL Server 2008R2.

 

SELECT T0.CardCode, T2.ItmsGrpNam
FROM OITM T0
INNER JOIN OITB T2 ON T0.ItmsGrpCod=T2.ItmsGrpCod
GROUP BY  T0.CardCode, T2.ItmsGrpNam  WITH CUBE

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It yields this result set that looks like this:

CardCode | ItmsGrpNam
BrandX     | BrandX A
 (NULL)    |  BrandX A
BrandX     | BrandX B
 (NULL)    |  BrandX B

I am trying to get this result set:

CardCode | ItmsGrpNam
BrandX     | BrandX A
BrandX     |  BrandX B

OR this one:

CardCode | ItmsGrpNam
BrandX     | BrandX A
(NULL)      |  BrandX B

Can someone show me how to properly structure this query to achieve the desired result? Thanks.