Hey. The two solutions mentioned in the StackOverflow link notes that you need HighStock to have them work. We’re switching out HighCharts for HighStock in Charts 3 and it is the task the team is working right now. There isn’t a release including this yet, but Charts 3 alpha 9 should be the first one which should include it. Then the dataSeries → dataGrouping should be available. If using Charts 3 is an option for you, then I’d test it with the next release which is due on 2016-02-04.