Bug 34848 Accessibility: cannot easily switch between the type hierarchys
Before there were keybindings we had support to switch between type hierarchies using ctrl keys. We had to remove this support for 2.1. Here are the options: 1) adding global actions (initially with no keybinding defined) 2) add the actions to switch between the hierarchy displays to the View drop down (which is accessible) 3) revive the ctrl keys and use a key listener. I suggest that we do 2) for 2.1.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
private IPartListener2 fPartListener;
	private int fCurrentOrientation;
	private boolean fLinkingEnabled;
	
	private boolean fIsVisible;
	private boolean fNeedRefresh;	
	private boolean fIsEnableMemberFilter;
	private boolean fIsRefreshRunnablePosted;
	
	private int fCurrentViewerIndex;
	private TypeHierarchyViewer[] fAllViewers;
	
	private MethodsViewer fMethodsViewer;	
	
	private SashForm fTypeMethodsSplitter;
	private PageBook fViewerbook;
	private PageBook fPagebook;
	
	private Label fNoHierarchyShownLabel;
	private Label fEmptyTypesViewer;
	
	private ViewForm fTypeViewerViewForm;
	private ViewForm fMethodViewerViewForm;
	
	private CLabel fMethodViewerPaneLabel;
	private JavaUILabelProvider fPaneLabelProvider;
	
	private ToggleViewAction[] fViewActions;
	private ToggleLinkingAction fToggleLinkingAction;
	private HistoryDropDownAction fHistoryDropDownAction;