Bug 305739 [viewers] #expandToLevel(Object, level) retrieves all children when virtual
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
}
					}
					if (removed) {
						setSelection(new TreeSelection(
								(TreePath[]) oldSelection
										.toArray(new TreePath[oldSelection
												.size()]), getComparer()),
								false);
					}
				}
			}
		});
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#handleTreeExpand(org.eclipse.swt.events.TreeEvent)
	 */
	protected void handleTreeExpand(TreeEvent event) {
	    
		if( isCellEditorActive() ) {
			applyEditorValue();
		}
		
		if (contentProviderIsLazy) {
			if (event.item.getData() != null) {
				Item[] children = getChildren(event.item);
				if (children.length == 1 && children[0].getData()==null) {
					
					
					virtualLazyUpdateChildCount(event.item, children.length);
				}