Title: Use ENTER key like as TAB key
Set the KeyPreview property of your form to True and use WM_NEXTDLGCTL message.
procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
if Key=VK_RETURN then
Form1.Perform(WM_NEXTDLGCTL, 0, 0);
end;