Plot two oscillators on the same chart with Expert Advisor

[David986]

Hello

I want to plot RSI and CCI on the same chart.

I tried to use "ChartIndicatorAdd" as described here https://www.mql5.com/en/docs/chart_operations/chartindicatoradd

but it seems not working: RSI and CCI still appear on two separate windows.

Here is the code I run:

int OnInit()
{
   RSIdefinition = iRSI(_Symbol, _Period, PeriodRSI, PRICE_CLOSE);
   if(RSIdefinition == INVALID_HANDLE)
   {
      printf("Error creating RSI indicator");
      return(INIT_FAILED);
   }
   ChartIndicatorAdd(ChartID(), 0, RSIdefinition);

   CCIdefinition = iCCI(_Symbol, _Period, PeriodCCI, PRICE_CLOSE);
   if(CCIdefinition == INVALID_HANDLE)
   {
      printf("Error creating CCI indicator");
      return(INIT_FAILED);
   }
   ChartIndicatorAdd(ChartID(), 0, CCIdefinition);

   return(INIT_SUCCEEDED);
}

I tried modifying the chart_id number and the subwindow number but nothing changes.

Do you have any idea why it doesn't work? Where is my mistake?

Thank you in advance!