c# - Callback using ObservableObject with a Collection on windows phone Viewmodels -


i've issue in code i'm writing attempting use observableobject within databinding when using list of items. have model view when binding single observableobject fine, when bind list of observableobject stops working when update 1 items.

so have following;

public class songviewmodel : observableobject

and in separate class;

public class albumviewmodel      {         observablecollection<songviewmodel> _songs = new observablecollection<songviewmodel>();

binding longlistselection uses songviewmodel data source working ok, bind albumviewmodel update callback stops working , ui isn't updated.

i've created small windows phone 8 solution demonstrate issue:

http://moonmirage.no-ip.org/wcf_phone.zip


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