This class shows the example of using portlet preferences in WPF. Use this class as LJO and use setPreferences and getPreference method to set and get preferences.
I hope this may help ur hunt.
Use of portlet preferences in WPF
Can any one post some more details of preferences usage with WPF. As I know preferences can be stored during the action phase of portlet cycle and how this will be handled in wpf.
If possible pls share the difference between calling a method using processAction("") and callMethod("") methods of webAppAccess API in context with portlet life cycle.