Bug 24250 Type Hierarchy doesn't show all inherited members on focus change
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
getSite().setSelectionProvider(fSelectionProviderMediator);
		getSite().getPage().addPartListener(fPartListener);
		
		IJavaElement input= determineInputElement();
		if (fMemento != null) {
			restoreState(fMemento, input);
		} else if (input != null) {
			setInputElement(input);
		} else {
			setViewerVisibility(false);
		}
		WorkbenchHelp.setHelp(fPagebook, IJavaHelpContextIds.TYPE_HIERARCHY_VIEW);
		
		fActionGroups= new CompositeActionGroup(new ActionGroup[] {
				new NewWizardsActionGroup(this.getSite()),
				new OpenEditorActionGroup(this), 
				new OpenViewActionGroup(this), 
				new ShowActionGroup(this), 
				fCCPActionGroup= new CCPActionGroup(this), 
				new RefactorActionGroup(this),
				new GenerateActionGroup(this),
				new JavaSearchActionGroup(this)});
		
		fActionGroups.fillActionBars(getViewSite().getActionBars());
		
		initDragAndDrop();		
	}
	/**
	 * called from ToggleOrientationAction.
	 * @param orientation VIEW_ORIENTATION_SINGLE, VIEW_ORIENTATION_HORIZONTAL or VIEW_ORIENTATION_VERTICAL