wxBitmap SetAutowrapBitmap (wxBitmap *bitmap)
Sets the bitmap that is drawn at the end of a line when it is automatically line-wrapped. If bitmap is NULL, no autowrap indicator is drawn (this is the default). The previously used bitmap (possibly NULL) is returned.
A bitmap passed to SetAutowrapBitmap will never be automatically deleted. The bitmap will not be modified. It may be selected into a wxMemoryDC object, but it will be selected out if SetAutowrapBitmap is called again.