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The expansion model doesn't work with the Show/Hide Contents. ExpansionModel allows to declare new compartment on existing element and describe the allowed elements for these new compartment, but its ViewProvider (org.eclipse.papyrus.infra.gmfdiag.expansion.expansionmodel.providers.ExpandViewProvider) is not able to provide valuable createNode method when the semanticHint of the view to create is null. We get a semanticHint==null by the ShowHideContentsAction (org.eclipse.papyrus.uml.diagram.common.actions.ShowHideContentsAction.CompartmentEditPartRepresentation.canContain(Element)).