code: private void bindUpstream(BioPAXElement element)
  	{
  		AbstractNode node = (AbstractNode) graph.getGraphObject(element);
  
  		if (node != null)
  		{
  			Edge edge = new EdgeL3(node, this, graph);
  			node.getDownstreamNoInit().add(edge);
  			this.getUpstreamNoInit().add(edge);
  		}
  	}
docs: Puts the wrapper of the parameter element to the upstream of this Control.
  @param element to put at upstream