Dojo Stacked Columns Chart for Web Map Pop Up

[LisCollins]

Anyone know how to use the the StackedColumns chart in dojo for ArcGIS JavaScript API? I need to add a stacked chart to my popup window.

I can only find the documentation below regarding using charts:
https://developers.arcgis.com/javascript/jshelp/intro_popuptemplate.html
http://dojotoolkit.org/documentation/tutorials/1.6/charting/

But it doesn't tell you how to add the different fields needed for the stacked columns (or stacked charts in general).

Any ideas? Here is a snippet of the code I tried, but can't get the stacked chart to display:

var popupTemplate = new PopupTemplate({ title: "City: " + "{CITY}", description: "View PDF ",

 mediaInfos: [{
    type: "StackedColumns",
    value: {
    fields: ["Series A", ("Geo70", "Geo03", "Geo10"), "Series B", ("Par70", "Par03", "Par10")],
    theme:"Julie"
    }

    }],

    showAttachments: false
  });

Then my featureLayer code is listed next with a link to the service and all the outfields listed above, and the addLayer function.

A chart displays if I change my type to "piechart" or one of the other charts that has simple requirements.