Listbox in other Listbox, Itemsource, Binding?

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I would like to know How to refresh our ListBox item. I tried OnPropertyChanged method, ObservableCollection, but it didn't work. I tried set again the itemsource property, so that worked, but now I have got 2 ListBox and now it's complicated.

It's a wp7 project there is the main interface. You can see I have 2 listbox there is the properties: List complexNameDays; public List ComplexNameDays { get { return complexNameDays; } set { complexNameDays = value; OnPropertyChanged("ComplexNameDays"); } } public class SelectedNameDays : Notifier { NameDay _nameday; public NameDay NameDay { get { return _nameday; } set { _nameday = value; OnPropertyChanged("NameDay"); } } public List FacebookFriends { get; set; } public SelectedNameDays() { _nameday = new NameDay(); } } public class FacebookFriend { public long Id { get; set; } public string Name { get; set; } public string Firstname { get; set; } public string Lastname { get; set; } public string Birthday { get; set; } public string Gender { get; set; } public Uri Picture { get; set; } } The begining of the code is correct, that works, because when the Constructor set the datas I set retry the itemsource of lbsNameDays, but I cant find the "asdf" listbox, I can't set their datas again. So the 2 main question are that.

1. How can I fire the property changed if that, and the observable collecton doesn't works. 2.

How can I use asdf listbox in the datatemplate thank the answer, and I sorry my grammer mistakes c# wpf silverlight windows-phone-7 link|improve this question asked 19 mins agouser127238882.

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