Bug 287621 [CommonNavigator] Add more tracing
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonViewerSorter.java
sorter =  sorterService.findSorter(sourceOfLvalue,
					parent, e1, e2) ;
					break;
			case RIGHT_UNDERSTANDS: 
				sorter =  sorterService.findSorter(sourceOfRvalue,
					parent, e1, e2) ;
					break;
		}
		 
		if (sorter != null) {
			return sorter.compare(viewer, e1, e2);
		}
 
		int categoryDelta = category(e1) - category(e2);
		if (categoryDelta == 0) {
			return super.compare(viewer, e1, e2);
		}
		return categoryDelta;
	}
    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ViewerComparator#isSorterProperty(java.lang.Object, java.lang.String)
     */
    public boolean isSorterProperty(Object element, String property) {
    	
    	NavigatorContentServiceContentProvider cp = (NavigatorContentServiceContentProvider) contentService.createCommonContentProvider();
    	TreePath[] parentPaths = cp.getParents(element);
    	for (int i = 0; i < parentPaths.length; i++) {
    		if (isSorterProperty(parentPaths[i], element, property))
    			return true;
    	}