procedure TForm1.Label1MouseDown(Sender: TObject; Button: TMouseButton;
 Shift: TShiftState; X, Y: Integer);
 const SC_DragMove = $F012; { a magic number }
{©Drkb v.3(2007): www.drkb.ru}
begin
 ReleaseCapture;
 Form1.perform(WM_SysCommand, SC_DragMove, 0);
end;