Bug 89137 [JFace] - API Review - "temporary" API in AbstractTreeViewer
AbstractTreeViewer contains two methods documented as "temporary" internalRefresh(Widget, Object) internalAdd(Widget, Object, Object [])
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
* @param element
	 *            the element
	 */
	protected void unmapElement(Object element) {
		if (elementMap != null) {
			elementMap.remove(element);
		}
	}
	/**
	 * Removes the given association from the internal element to widget map.
	 * Does nothing if mapping is disabled, or if the given element does not map
	 * to the given item.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * 
	 * @param element
	 *            the element
	 * @param item the item to unmap
	 * @since 2.0
	 */
	protected void unmapElement(Object element, Widget item) {
		
		
		if (elementMap != null && elementMap.get(element) == item) {
			
			unmapElement(element);
		}
	}