Bug 130182 [CommonNavigator][Help] missing help in Customize View dialog
open the Filters... dialog and click the help button, note no help appears.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/INavigatorViewerDescriptor.java
boolean isRootExtension(String aContentExtensionId);
	/**
	 * Returns true if there exists at least one matching viewerContentBinding
	 * which declares isRoot as true. This behavior will override the default
	 * enablement for the viewer root.
	 * 
	 * @return True if there exists a matching viewerContentBinding which
	 *         declares isRoot as true.
	 */
	boolean hasOverriddenRootExtensions();
	/**
	 * Returns true by default. A true value indicates that object and view
	 * contributions should be supported by the popup menu of any viewer
	 * described by this viewer descriptor. The value may be overridden from the
	 * &lt;popupMenu /&gt; child element of the &lt;viewer /&gt; element in the
	 * <b>org.eclipse.ui.navigator.viewer</b> extension point.
	 * 
	 * @return True if object/view contributions should be allowed or False
	 *         otherwise.
	 */
	boolean allowsPlatformContributionsToContextMenu();
	/**
	 * 
	 * Custom insertion points are declared through a nested 'popupMenu' element
	 * in the <b>org.eclipse.ui.navigator.viewer</b> extension point. Each
	 * insertion point represents either a {@link Separator} or
	 * {@link GroupMarker} in the context menu of the viewer.
	 * <p>
	 * 
	 * @return The set of custom insertion points, if any. A null list indicates