Using a chart as a drilldown link

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I have a simple pie chart and I do not want to display the tabular data.  I also have a drilldown level and I want to click on the chart to drilldown since the tabular data is hidden. My chart is based on a calculated column that is  a percent of total survey responses. Maybe that is why I can't do it because I do not see that column listed in the drilldown link choices. Attached is my definition