Simuler la touche TAB en appuyant sur touche ENTER

procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
if Key = #13 then
begin
Key := #0;
{ check if SHIFT - Key is pressed }
if GetKeyState(VK_Sh if t) and $8000 <> 0 then
PostMessage(Handle, WM_NextDlgCtl, 1, 0)
else
PostMessage(Handle, WM_NextDlgCtl, 0, 0);
end;
end;

//Ne pas oublier Form1.KeyPreview := true !