Hi, Can you open a ticket in support portal ? You can try this approach for now: procedure TMainForm.UniButton2Click(Sender: TObject); var chartSeries: TUniLineSeries; begin chartSeries := Series1; with UniChart1, chartSeries do begin chartSeries.Title := 'New title'; JSInterface.JSCall('chart.getSeries()['+ IntToStr(SeriesList.IndexOf(chartSeries)) +'].setTitle', [Title]) end; end;