Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
updateChildren(widget, parent, elementChildren, true);
	}
	/**
	 * Updates the tree items to correspond to the child elements of the given
	 * parent element. If null is passed for the children, this method obtains
	 * them (only if needed).
	 * 
	 * @param widget
	 *            the widget
	 * @param parent
	 *            the parent element
	 * @param elementChildren
	 *            the child elements, or null
	 * @param updateLabels
	 *            <code>true</code> to update labels for existing elements,
	 *            <code>false</code> to only update labels as needed, assuming
	 *            that labels for existing elements are unchanged.
	 * @since 2.1
	 */
	private void updateChildren(Widget widget, Object parent,
			Object[] elementChildren, boolean updateLabels) {
		
		if (widget instanceof Item) {
			Item ti = (Item) widget;
			if (!getExpanded(ti)) {
				
				
				boolean needDummy = isExpandable(ti, null, parent);
				boolean haveDummy = false;