How to set another field in the bean with a valueChangeListener?

[Paul Spencer]

I have a bean with 2 fields, state and city, with a valueChangeListener 
on the state field.  The listener will set the city based on new new 
state.  The problem is the city is being overwritten in the model update 
phase.  So my question is:

  What is the best way to update another field inside a
  valueChangeListener so the updated value is not overwritten?
Paul Spencer