How put the color in chart with Xlsx

[obrienphao]

Hello,
I came here ask is possible to put the color in chart with Xlsx, i have my chart, but i have not find the methode for change the color of chart if possible the help me Example:

   ` QXlsx::Document xlsx("myExcel.xlsx");
     chart* histo->xlsx.insertChart(8, 8, QSize(300, 300));
     histo->setChartType(Chart::CT_BarChart);
     histo->setChartTitle("Conso");
     histo->addSeries(CellRange("B2:B10")); 
     histo->addSeries(CellRange("D2:D10")); 
     histo->addSeries(CellRange("C2:C10"));`

how put the color in different series ?