Use Delete and Add procedures of the RadioGroup.Items for removing and adding item. If you want add item in RadioGroup to a defined place, then use Exchange procedure after Add procedure.
procedure TForm1.Button1Click(Sender: TObject); begin RadioGroup1.Items.Delete(2); end; procedure TForm1.Button2Click(Sender: TObject); begin with RadioGroup1 do begin Items.Add(' New'+IntToStr(Items.Count-2)); Items.Exchange(2, Items.Count-1); end; end;