Mit AnimateWindow kannst Du eventuell selber den Effekt erzeugen den du brauchst
Delphi-Quellcode:
procedure TForm11.btn1Click(Sender: TObject);
begin
AnimateWindow(panel1.Handle, 600, AW_HOR_POSITIVE or AW_SLIDE or AW_ACTIVATE)
end;
procedure TForm11.btn2Click(Sender: TObject);
begin
AnimateWindow(panel1.Handle, 600, AW_HOR_NEGATIVE or AW_SLIDE or AW_HIDE)
end;
procedure TForm11.FormShow(Sender: TObject);
begin
panel1.Hide;
end;