[logbox-1.6] Appender Log Level Change Not Affecting Application

I am trying to programatically update the email appender log level to be overridded dynamically for a given environment.

I have the levelMax setting correctly, but I still get DEBUG messages after I change the levelMax to WARN.

Is there a reset or register-type method that needs to be called after I change the levelMax setting to update the application?

var logBox = controller.getLogBox();