if (((GEStreamNode)node).getSuccesors().size() != 0 )
if (node.getContainedElements().size() != 0 )
	public void collapseContainersAtLevel(int level)	{		ArrayList levelList = (ArrayList) this.levelContainers.get(new Integer(level));		if (levelList != null)		{			Iterator listIter = levelList.iterator();			while(listIter.hasNext())			{				 GEContainer node = (GEContainer) listIter.next();				 if (((GEStreamNode)node).getSuccesors().size() != 0 )				 {					node.collapse();				 }			}		}			}