Bug 257855 [CommonNavigator] Supporting Custom Transfertypes in Common Navigator Framework
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonViewer.java
protected void createTreeItem(Widget parent, final Object element, int index) {
		try {
			super.createTreeItem(parent, element, index);
		} catch (Exception ex) {
			ex.printStackTrace();
		} catch (Error e) {
			e.printStackTrace();
		}
	}
	/*
	 * @see ContentViewer#handleLabelProviderChanged(LabelProviderChangedEvent)
	 */
	protected void handleLabelProviderChanged(LabelProviderChangedEvent event) {
		Object[] changed = event.getElements();
		if (changed != null) {
			List others = new ArrayList();
			for (int i = 0; i < changed.length; i++) {
				if (changed[i] == null)
					continue;
				
				if (_mapper != null) {
					if (_mapper.handlesObject(changed[i])) {
						_mapper.objectChanged(changed[i]);
						continue;
					}
				}
				others.add(changed[i]);
			}
			if (others.isEmpty()) {
				return;