http://bugs.winehq.org/show_bug.cgi?id=31710
--- Comment #7 from Tony Crawford tonybcrawford@gmail.com 2012-09-16 15:17:02 CDT --- Further info: The color GREY of the rectangles is being determined by the BackColor property value of the PictureBox which is being used as the OpenGL canvas. When I change this property to BLACK, the rectangles are now BLACK rather than GREY.