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
fFilterActions= new MethodsViewerFilterAction[] { hideFields, hideStatic, hideNonPublic };
		
		addFilter(fFilter);
		
		fShowInheritedMembersAction= new ShowInheritedMembersAction(this, false);
		showInheritedMethods(false);
		
		fStandardGroups= new ContextMenuGroup[] {
			new JavaSearchGroup(), new GenerateGroup()
		};
		
		setSorter(new MethodsViewerSorter());
	}
	
	/**
	 * Show inherited methods
	 */
	public void showInheritedMethods(boolean on) {
		MethodsContentProvider cprovider= (MethodsContentProvider) getContentProvider();
		try {
			cprovider.showInheritedMethods(on);
			fShowInheritedMembersAction.setChecked(on);
			
			JavaElementLabelProvider lprovider= (JavaElementLabelProvider) getLabelProvider();
			if (on) {
				lprovider.turnOn(JavaElementLabelProvider.SHOW_POST_QUALIFIED);
			} else {
				lprovider.turnOff(JavaElementLabelProvider.SHOW_POST_QUALIFIED);