https://bugs.winehq.org/show_bug.cgi?id=41560
--- Comment #2 from Alistair Leslie-Hughes leslie_alistair@hotmail.com --- When the BCG Framework calls EnableScrollBar, it assumes that the custom draw code will be called via standard WM_PAINT messages. However, wine just calls though to its own SCROLL_DrawScrollBar which is why the standard scrollbars appear.