[dr. F.I.N.]

Код:

procedure DoSomething(flag: Integer);
begin
  case flag of
  0: {do action 1};
  1: {do action 2};
  ...
  n: {do action n};
  else 
    {do another action};
  end;
end;

procedure TForm1.Combobox1Change(Sender: TObject);
var
  i: Integer;
begin
  for i := Combobox1.ItemIndex to Combobox1.Items.Count - 1 do
    DoSomething(i);
end;