param model element modelel add node param locat point drop node code code accept param diagram diagram add node add node collect model element point locat argo diagram diagram mutabl graph model gm mutabl graph model diagram graph model collect old target target manag instanc target count object model element diagram uml diagram uml diagram diagram doe accept uml diagram diagram drop locat model facad nari associ add exist node command cmd add exist node command locat count cmd execut model facad auml element gm add edg gm add edg todo associ possibl add effect ad node relat edg doesn work thing current structur tfm model facad associ mode creat associ build activ layer global cur editor gm add node add exist node command cmd add exist node command locat count cmd execut target manag instanc set target old target 