Bug 91409 Project Open/Close items are disabled when Package Explorer active
Project Open/Close option in the Project menu is disabled in Plugin prespective.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/WorkingSetActionGroup.java
fRemoveAction.update(selection);
			selectionProvider.addSelectionChangedListener(fRemoveAction);
			
			fEditAction= new OpenPropertiesWorkingSetAction(fSite);
			fEditAction.update(selection);
			selectionProvider.addSelectionChangedListener(fEditAction);
			
			fCloseAction= OpenCloseWorkingSetAction.createCloseAction(fSite);
			actionBars.setGlobalActionHandler(IDEActionFactory.CLOSE_PROJECT.getId(), fCloseAction);
			fCloseAction.update(selection);
			selectionProvider.addSelectionChangedListener(fCloseAction);
			
			fOpenAction= OpenCloseWorkingSetAction.createOpenAction(fSite);
			actionBars.setGlobalActionHandler(IDEActionFactory.OPEN_PROJECT.getId(), fOpenAction);
			fOpenAction.update(selection);
			selectionProvider.addSelectionChangedListener(fOpenAction);
		}
	};
	
	private RemoveWorkingSetElementAction fRemoveAction;
	private OpenPropertiesWorkingSetAction fEditAction;
	private OpenCloseWorkingSetAction fCloseAction;
	private OpenCloseWorkingSetAction fOpenAction;
	
	public WorkingSetActionGroup(IViewPart part) {
		fSite= part.getViewSite();
		fSite.getSelectionProvider().addSelectionChangedListener(fLazyInitializer);
	}
	
	public void dispose() {