Bug 126061 [Viewers] Need to document that virtual tables and trees ignore sorters and filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
*/
	public void cancelEditing() {
		treeViewerImpl.cancelEditing();
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void doUpdateItem(final Item item, Object element) {
		if (!(item instanceof TreeItem)) {
			return;
		}
		TreeItem treeItem = (TreeItem) item;
		if (treeItem.isDisposed()) {
			unmapElement(element, treeItem);
			return;
		}
		getColorAndFontCollector().setFontsAndColors(element);
		IBaseLabelProvider prov = getLabelProvider();
		ITableLabelProvider tprov = null;
		ILabelProvider lprov = null;
		IViewerLabelProvider vprov = null;
		ITreePathLabelProvider pprov = null;
		
		if(prov instanceof ILabelProvider) {
			lprov = (ILabelProvider) prov;
		}
		
		if (prov instanceof IViewerLabelProvider) {
			vprov = (IViewerLabelProvider) prov;
		}