crystal 9 charts 'Group' box in 'Data' Tab remains greyed out (I need Drilldown)

I guess it's something obvious however .....

Although I have old reports enabling Drilldown from Charts (and hence have the 'Group' Box enabled in Chart Assistant) I'm currently not enable to produce a new report with this option as the 'Group' Box is always greyed out even though I have created the Group Hierarchy. . Why is this ? What do I have to do to enable it ?  
TJPRIMEAsked:
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TJPRIMEConnect With a Mentor Author Commented:
Thabnks for your efforts and sorry in the delay. It is now solved. I needed A Summary Total in the Group.
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mlmccCommented:
I assume you have data available to the report?

mlmcc
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TJPRIMEAuthor Commented:
Yes. There is data available. Also when selecting the +data values in the hierarchy at the side of the Report Display that drops down fine.
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mlmccCommented:
Is it available when you preview the report?

There are some formatting features of charts that can only be done while previewing the chart.

mlmcc
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