Bug 184877 [CommonNavigator] No F1 help for Project Explorer view
Build: I20070501-0010 1) Open the Project Explorer view 2) Hit F1 -> There is no help available for this view.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
* {@link org.eclipse.ui.navigator.CommonViewer}: The viewer that renders the
 * extensible tree. Creates and manages the lifecylce of the Navigator Content
 * Service (described below).
 * </p>
 * </li>
 * <li>
 * <p>
 * {@link org.eclipse.ui.navigator.NavigatorActionService}: Manages instances
 * of {@link org.eclipse.ui.navigator.CommonActionProvider}s provided by
 * individual extensions and content extensions.
 * </p>
 * </li>
 * <li>
 * <p>
 * {@link org.eclipse.ui.navigator.INavigatorContentService}: Manages instances
 * of Navigator Content Extensions. Instances are created as needed, and
 * disposed of upon the disposal of the Navigator Content Service.
 * </p>
 * </li>
 * </ul>
 * <p>
 * Clients are not expected to subclass CommonNavigator. Clients that wish to
 * define their own custom extensible navigator view need to specify an instance
 * of the <b>org.eclipse.ui.views</b> extension point:
 * 
 * <pre>
 *   
 *          &lt;extension
 *          		point=&quot;org.eclipse.ui.views&quot;&gt;
 *          	&lt;view