Bug 233285 [TabbedProperties] Adopt API tooling
The tabbed properties plug-in is still not API tooling enabled.
bundles/org.eclipse.ui.views.properties.tabbed/src/org/eclipse/ui/views/properties/tabbed/TabbedPropertySheetPage.java
*/
		if (hasTitleBar) {
			registry.getLabelProvider().addListener(this);
		}
	}
	/**
	 * Initialize the contributor with the provided contributor id.
	 * 
	 * @param contributorId
	 *            the contributor id.
	 */
	private void initContributor(String contributorId) {
		descriptorToTab = new HashMap();
		if (contributor.getContributorId().equals(contributorId)) {
			/**
			 * default contributor from the workbench part.
			 */
			registry = TabbedPropertyRegistryFactory.getInstance()
				.createRegistry(contributor);
		} else {
			/**
			 * selection contributor.
			 */
			selectionContributor = new TabbedPropertySheetPageContributorFromSelection(
				contributorId);
			registry = TabbedPropertyRegistryFactory.getInstance()
				.createRegistry(selectionContributor);
		}
		currentContributorId = contributorId;
		tabListContentProvider = getTabListContentProvider();