Bug 12449 delete action in type hierarchy is not registered on 'del' key
TypeHierarchyViewPart should call ReorgGroup.createDeleteAction see PackageExplorerViewPart
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
/*
	 * @see IViewPart#init
	 */
	public void init(IViewSite site, IMemento memento) throws PartInitException {
		super.init(site, memento);
		fMemento= memento;
	}	
	
	/*
	 * @see ViewPart#saveState(IMemento)
	 */
	public void saveState(IMemento memento) {
		if (fPagebook == null) {
			
			if (fMemento != null) { 
				memento.putMemento(fMemento);
			}
			return;
		}
		if (fInputElement != null) {
			memento.putString(TAG_INPUT, fInputElement.getHandleIdentifier());
		}
		memento.putInteger(TAG_VIEW, getViewIndex());
		memento.putInteger(TAG_ORIENTATION, fCurrentOrientation);	
		int weigths[]= fTypeMethodsSplitter.getWeights();
		int ratio= (weigths[0] * 1000) / (weigths[0] + weigths[1]);
		memento.putInteger(TAG_RATIO, ratio);
		
		ScrollBar bar= getCurrentViewer().getTree().getVerticalBar();
		int position= bar != null ? bar.getSelection() : 0;