i create diagram file from one .ecore file by GMF. I want make label for my connection. for this, i add label to 'polyline connection' in .gmpgraph but this added label or even other changes on 'Figure Descriptor' of my connection doesn't present in diagram file!for example i change 'Line kind' feature of 'polyline connection' from 'line-Solid' to 'line-DashDotDot', but this values doesn't cause any difference!

second my question is about creating of instance from features of class.'Figure Descriptor' of my class in .gmfgraph contains one rectangle and 'child accesses' related to it's features. but i don't know how use from feature in created diagram file! when i draw one object from my classes in created diagram file, and want change name of this object i get this error:" An error has occurred. See error log for more details.
org/eclipse/gmf/runtime/gef/ui/internal/parts/CellEditorEx".