Hi Shwarz,
My apologies for the inconvienience caused.
I havied created your same project in 2003.But I am unable to reproduce the issue here.BorderStyle set to FixedSingle and BorderSides to Bottom behaves in the same way as in 2005.Could you please verify this 2003 project and let me know the difference as you said earlier.
Sample
Thank you for your patience.
Regards,
Anu.