It seems that you are trying to group the chart's data source. This feature is currently supported only by the RadChart
and is illustrated in Grouping databound items
Such an idea about the RadHtmlChart
control has already been logged as a PITS item here
, so that you can follow its progress cast you vote and/or leave a comment(e.g., how you would expect things to work).
For the time being you can manually group the data source of the chart, prior to binding it. Such an example is illustrated in the attached archive.
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