Must initialise the canvas pointer in Graphics_buffer and clear it out when a wxGraphicsBuffer is destroyed. See http://www.cmiss.org/cmgui/tracker/550
Must initialise the canvas pointer in Graphics_buffer
and clear it out when a wxGraphicsBuffer is destroyed.
See http://www.cmiss.org/cmgui/tracker/550


git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@5502 3c1deb5b-d424-0410-962d-aba41a686d42

hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc