Hello Sodi We,
We have created a special ExpressionGroupDescriptor which allows you to specify the sorting order of the groups but I am afraid that It might be difficult to determine the correct grouping order by a column other than the one that the grouping is performed on. Let me explain the possible problem: The order of the groups is determined after the groups are constructed. The problem here is that a single group contains many rows - which of those items will determine the order of the group?
There is another possible way to tackle the problem at hand. As you have said, grouping by column B is undesirable since the groups will be arranged alphabetically. Is it possible to determine the correct order just by inspecting the string of the group? The attached project does something very similar. A grouping is performed on a property of type DayOfWeek which has a predefined order for all days. The application demonstrates how you can change the order of the grouping by inspecting the value of each group and assigning it an integer value which determines the actual order.
Hope this helps. Correct me if I haven't understood your scenario correctly.
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