I'm trying to create a custom figure as described in the GMF Tutorial
BPMN, but the figure just draws a read box (I guess which should
indicate problesm rendering the figure). I saw BUG139130 which
recommands to add the xerces plugin. But this didn't move me foward as
well (Well the bug as I interprete is also should have been fixed I'm
using version 1.0.1 of gmf.