Under XView, Motif and Windows 3.1, the default colourmap is used for canvases. Future versions of wxWindows should improve upon colourmap handling.
The presence of a monochrome screen can be detected so the application can change its use of colour accordingly. Currently, wxWindows tries to choose appropriate pen and brush colours for a monochrome display. To override this behaviour, set the device context Colour member to TRUE and choose custom colours for drawing graphics.