Bug 257855 [CommonNavigator] Supporting Custom Transfertypes in Common Navigator Framework
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonViewer.java
_mapper = mapper;
	}
	
	/**
	 * Gets the {@link ICommonViewerMapper} assigned to this viewer.
	 * 
	 * @return the mapper
	 * @since 3.4
	 */
	public ICommonViewerMapper getMapper() {
		return _mapper;
	}
	
	/**
	 * @return the CommonNavigator
	 * @since 3.4
	 */
	public CommonNavigator getCommonNavigator() {
		return commonNavigator;
	}
	
	protected void removeWithoutRefresh(Object[] elements) {
		super.remove(elements);
	}
	/**
	 * <p>
	 * Adds DND support to the Navigator. Uses hooks into the extensible
	 * framework for DND.
	 * </p>
	 * <p>