Bug 257855 [CommonNavigator] Supporting Custom Transfertypes in Common Navigator Framework
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonViewer.java
}
			event = new LabelProviderChangedEvent((IBaseLabelProvider) event
					.getSource(), others.toArray());
		}
		super.handleLabelProviderChanged(event);
	}
	protected void handleDispose(DisposeEvent event) {
		dispose();
		super.handleDispose(event);
	}
 
	/**
	 * <p>
	 * Disposes of the NavigatorContentService, which will dispose the Content
	 * and Label providers.
	 * </p>
	 */
	public void dispose() {
		if (contentService != null) {
			contentService.dispose();
		}
		clearSelectionCache();
	}
	/**
	 * Sets this viewer's sorter and triggers refiltering and resorting of this
	 * viewer's element. Passing <code>null</code> turns sorting off.
	 * 
	 * @param sorter
	 *            a viewer sorter, or <code>null</code> if none
	 */