Forcing the Subgrid in CRM365 be refreshed with Use Legacy rendering set to yes

Hi All,

We are in the process of first upgrade from CRM2011 to CRM365 on premise.

for the first stage of update we are leaving the "Use legacy form rendering" in system setting equal to yes.

I try to removes the records in the subgrid after changing a value of a drop down and then the subgrid should be refreshed on the screen using the below function.

function onrefreshRespondents() {
      document.getElementById("Respondents").control.initialize();  //--> I also removed this unsupported line but still not working
      var control = Xrm.Page.ui.controls.get("Respondents");
       control.refresh();
}

the above code works in 2011  but it does not refresh the subgrid in CRM365.

any suggestion how I can make it work?

Thanks,

Maryam