now I have a script about switching IK-Fk with each other entirly or perfectly,it works in the script editor of maya,including some maya command,setAttr or getAttr or xform,but it dones't work in the maya expression editor,it confused me,when I change the switch state into IK or FK,the position of the FK or IK can't attach to the others,automactically,smart you ,do you know to solve the problem,thanks in advance