Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
virtualLazyUpdateWidget(parent, index);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#internalRefreshStruct(org.eclipse.swt.widgets.Widget,
	 *      java.lang.Object, boolean)
	 */
	protected void internalRefreshStruct(Widget widget, Object element,
			boolean updateLabels) {
		if (contentProviderIsLazy) {
			
			virtualRefreshChildCounts(widget, element);
			
			if (updateLabels) {
				if (widget instanceof Tree) {
					((Tree) widget).clearAll(true);
				} else if (widget instanceof TreeItem) {
					((TreeItem) widget).clearAll(true);
				}
			}
			return;
		}
		super.internalRefreshStruct(widget, element, updateLabels);
	}
	/**
	 * Traverses the visible (expanded) part of the tree and updates child
	 * counts.
	 *