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
});
		handler.addPostSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				handlePostSelect(e);
			}
		});
		handler.addOpenListener(new IOpenEventListener() {
			public void handleOpen(SelectionEvent e) {
				StructuredViewer.this.handleOpen(e);
			}
		});
	}
	/**
	 * Returns whether this viewer has any filters.
	 * @return boolean
	 */
	protected boolean hasFilters() {
		return filters != null && filters.size() > 0;
	}
	/**
	 * Refreshes this viewer starting at the given element.
	 * 
	 * @param element
	 *            the element
	 */
	protected abstract void internalRefresh(Object element);
	/**
	 * Refreshes this viewer starting at the given element. Labels are updated
	 * as described in <code>refresh(boolean updateLabels)</code>.
	 * <p>