Chart for 2 on change of and 2 show values

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hi,
i am using crystal reports 11 and was wondering if anybody has been able to format a chart ( i am using stacked chart)
where you could use 2 on change and 2 show values so that we would have a subgroup count withing the group count.
When i do this on stacked chart it gives error.

So is anybody aware of doing this.

Thanks.