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
fEnableMemberFilterAction.setChecked(on);
	}
	
	/**
	 * called from ShowQualifiedTypeNamesAction. Must be called after creation
	 * of the viewpart.
	 */	
	public void showQualifiedTypeNames(boolean on) {
		if (fAllViewers == null) {
			return;
		}
		for (int i= 0; i < fAllViewers.length; i++) {
			fAllViewers[i].setQualifiedTypeName(on);
		}
	}
	
	private boolean isShowQualifiedTypeNames() {
		return fShowQualifiedTypeNamesAction.isChecked();
	}
	
	/**
	 * Called from ITypeHierarchyLifeCycleListener.
	 * Can be called from any thread
	 */
	protected void doTypeHierarchyChanged(final TypeHierarchyLifeCycle typeHierarchy, final IType[] changedTypes) {
		if (!fIsVisible) {
			fNeedRefresh= true;
			return;
		}
		if (fIsRefreshRunnablePosted) {