const
  HORZ_COUNT = 2;
  VERT_COUNT = 2;
begin
  ImageEnMView1.LockUpdate();
  try
    ImageEnMView1.GridWidth   := -1;
    ImageEnMView1.ThumbWidth  := -1 * HORZ_COUNT;
    ImageEnMView1.ThumbHeight := -1 * VERT_COUNT;
    ImageEnMView1.ScrollBars := ssVertical;
    ImageEnMView1.LoadFromFileOnDemand( 'D:\MultiPageDoc.pdf' );
  finally
    ImageEnMView1.UnlockUpdate();
  end;
end;