User LifeCyle

Hello Experts, I' m a new guy in Aras Innovator. in the first step I created a Lifecycle for the User. Everytime a new user is created, the Lifecycle state will set the state to "enabled" with  an"onAfterAdd" method. This works fine for me. In the next step I want to create another Server method, which should automatically change the Lifecycle state from "enabled" to "disbaled" if the logon_enabled property changed from 1 to 0. Any idea how to solve this problem? Regards John