Bug 5492 Open in Hierarchy method list is enabled even when nothing is selected
206 1) Ensure no item is selected in the hierachy view's member list 2) Right click - not on an item 3) Open is present and enabled 4) Select Open, nothing happens
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/MethodsViewer.java
private OpenJavaElementAction fOpen;
	
	private TableColumn fTableColumn;
	private ShowInheritedMembersAction fShowInheritedMembersAction;
	private ContextMenuGroup[] fStandardGroups;	
	
	public MethodsViewer(Composite parent, IWorkbenchPart part) {
		super(new Table(parent, SWT.MULTI));
		
		fProblemItemMapper= new ProblemItemMapper();
		
		fTableColumn= new TableColumn(getTable(), SWT.NULL | SWT.MULTI | SWT.FULL_SELECTION);
		
		getTable().addControlListener(new ControlAdapter() {
			public void controlResized(ControlEvent e) {
				adjustTableColumnSize();
			}
		});
		JavaElementLabelProvider lprovider= new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_DEFAULT);
		lprovider.setErrorTickManager(new MarkerErrorTickProvider());
		MethodsContentProvider contentProvider= new MethodsContentProvider();
		setLabelProvider(lprovider);
		setContentProvider(contentProvider);
				
		fOpen= new OpenJavaElementAction(this);
		
		addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				fOpen.run();
			}