if (ChainBuilderAgent.DEBUG) { System.err.println("mouse pressing and starting link"); System.err.println("start param link. link state is LINKING_PARAMS"); }
 	private void startParamLink(FormalParameter param) {		////System.err.println("mouse pressing and starting link");		linkOrigin = param;		link = new ParamLink();		linkLayer.addChild(link);		link.setStartParam(linkOrigin);		link.setPickable(false);		//System.err.println("start param link. link state is LINKING_PARAMS");		linkState = LINKING_PARAMS;			 	}