I'm trying to get a bar chart with grouped categories.
In Highchart it's done like this for example: http://jsfiddle.net/fieldsure/Lr5sjh5x/2/
When I design a report in the ad-hoc designer, it works the same way. When I design it in jaspersoft studio, I cannot get it to work.
I have 2 levels of categories defined in the chart data.
I guessed I should define it in the chart property xAxis.categories but I cannot get it to work. What should I write here to get it working?