i have a chart that doesn't hide the previous series when i click for the drilldown on a column. New series is added, but beside of the old series, how can i solve the problem? I also tried to not adding a new series, but simply keeping the drilldown option on the old series; still the old series doesn't disappear when i click on a column (i was expecting an empty chart with this drilldown).

Edit: I have three charts loaded. First chart -> drilldown -> second chart -> drilldown -> third chart -> broken drilldown. I noticed that the "load" function of the third chart is never called. And, the button of the previous second drilldown never disappear.