Product Version = NetBeans IDE Dev (Build 201110180600)
Operating System = Windows XP version 5.1 running on x86
Java; VM; Vendor = 1.7.0
Runtime = Java HotSpot(TM) Client VM 21.0-b17

JSF page:
valueChangeListener="#{editUserMaintenance.valueChanged}"

Bean:
    public void valueChanged(ValueChangeEvent event){...}

In the editor NB displays a warning "unknown property".
Right, ther is no such property. 
A valueChangeListener is never bound to an property, but a method.
--> If element is a listener, don't check for properties. Check for method (with correct signature if possible).