Fixed callback to cmiss_graphic from glyph object after the cmiss_graphic has been deleted. Tracker item 2610, https://tracker.physiomeproject.org/show_bug.cgi?id=2610
Fixed callback to cmiss_graphic from glyph object after the cmiss_graphic has been deleted. Tracker item 2610, https://tracker.physiomeproject.org/show_bug.cgi?id=2610

cmiss/cmgui,cmiss/cmgui