protected override void OnMouseWheel(MouseEventArgs e)
{
if (e.Delta > 0)
{
scrollbar.Position--;
}
else if (e.Delta < 0)
{
scrollbar.Position++;
}
scrollbar.Update();
scrollbar.Invalidate();
firstFileToShow = scrollbar.Position * (Width / (imageList[0].Width + 20));
ShowFiles(false);
Update();
Invalidate();
}
