Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
internalCollapseToLevel(w, level);
		}
	}
	/**
	 * Creates all children for the given widget.
	 * <p>
	 * The default implementation of this framework method assumes that
	 * <code>widget.getData()</code> returns the element corresponding to the
	 * node. Note: the node is not visually expanded! You may have to call
	 * <code>parent.setExpanded(true)</code>.
	 * </p>
	 * 
	 * @param widget
	 *            the widget
	 */
	protected void createChildren(final Widget widget) {
		final Item[] tis = getChildren(widget);
		if (tis != null && tis.length > 0) {
			Object data = tis[0].getData();
			if (data != null) {
				return; 
			}
		}
		BusyIndicator.showWhile(widget.getDisplay(), new Runnable() {
			public void run() {
				
				
				if (tis != null) {
					for (int i = 0; i < tis.length; i++) {
						if (tis[i].getData() != null) {