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/packageview/PackageExplorerActionGroup.java
private GotoPackageAction fGotoPackageAction;
	private GotoResourceAction fGotoResourceAction;
	private CollapseAllAction fCollapseAllAction;
	
	
	private ToggleLinkingAction fToggleLinkingAction;
	private RefactorActionGroup fRefactorActionGroup;
	private NavigateActionGroup fNavigateActionGroup;
	private ViewActionGroup fViewActionGroup;
	
	private CustomFiltersActionGroup fCustomFiltersActionGroup;
	private IAction fGotoRequiredProjectAction;	
 	
	public PackageExplorerActionGroup(PackageExplorerPart part) {
		super();
		fPart= part;
		TreeViewer viewer= part.getViewer();
		
		IPropertyChangeListener workingSetListener= new IPropertyChangeListener() {
			public void propertyChange(PropertyChangeEvent event) {
				doWorkingSetChanged(event);
			}
		};
		
		IWorkbenchPartSite site = fPart.getSite();
		setGroups(new ActionGroup[] {
			new NewWizardsActionGroup(site),
			fNavigateActionGroup= new NavigateActionGroup(fPart), 
			new CCPActionGroup(fPart),
            new GenerateBuildPathActionGroup(fPart),