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procedure Form1_Button4_OnClick (Sender: string; var Cancel: boolean);
var
    Results: TDataSet;
begin
    SQLQuery('SELECT FirstName, LastName FROM person', Results);
    DataSetToXML(Results, 'd:\1.xml');
    Results.Free;
end;

procedure Form1_OnShow (Sender: string; Action: string);
var
   reg: TRegistry;
   iDays: integer;
begin
     reg := TRegistry.Create;
     reg.Access := KEY_ALL_ACCESS;
     reg.RootKey := HKEY_CURRENT_USER;
     reg.OpenKey('software\MyVisualDatabaseTrial',true);
     if not reg.ValueExists('StartDate') then reg.WriteDate('StartDate', Now+30); // trial period is 30 days

     iDays := Trunc(reg.ReadDate('StartDate')) - Trunc(Now); // time left days

     reg.CloseKey;
     reg.Free;

     if iDays < 1 then
     begin
          if MessageDlg('Trial period is over.'+#13+' Do you want to visit a order page?', mtInformation, mbYes+mbNo, 0) = mrYes
              then OpenUrl('http://yourpage.com');

          Form1.Close;
          Exit;
     end;

     if MessageDlg('Demo version. Time left: ' + IntToStr(iDays) +' days.'+#13+'Do you want to visit a order page?', mtInformation, mbYes+mbNo, 0) = mrYes
         then OpenUrl('http://yourpage.com');

end;

begin
end.

procedure Form1_OnShow (Sender: string; Action: string); // event OnShow
var
   MyItem1: TMenuItem;
   MyItem2: TMenuItem;
   MySubItem3: TMenuItem;
begin
   MyItem1 := TMenuItem.Create (Form1.MainMenu);
   MyItem1.Caption := 'Item1';
   MyItem1.OnClick := @MenuClick1;

   MyItem2 := TMenuItem.Create (Form1.MainMenu);
   MyItem2.Caption := 'Item2';

   MySubItem3 := TMenuItem.Create (Form1.MainMenu);
   MySubItem3.Caption := 'Submenu';
   MySubItem3.OnClick := @MenuClick3;

   Form1.mniFile.Insert(0, MyItem1);
   Form1.MainMenu.Items.Insert(0, MyItem2);
   MyItem2.Add(MySubItem3);
end;

procedure MenuClick1 (Sender: string);
begin
     ShowMessage('Hello from MyItem1');
end;

procedure MenuClick3 (Sender: string);
begin
     ShowMessage('Hello from subitem');
end;

begin
end.