void MegaContacts_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { OnPropertyChanged("NumberOfMegaContacts"); OnPropertyChanged("IsMegaContactsListEmpty"); OnPropertyChanged("NumberOfMegaContactsText"); if (CurrentDisplayMode == ContactDisplayMode.EMPTY_CONTACTS || CurrentDisplayMode == ContactDisplayMode.CONTACTS) { if (IsMegaContactsListEmpty) { CurrentDisplayMode = ContactDisplayMode.EMPTY_CONTACTS; } else { CurrentDisplayMode = ContactDisplayMode.CONTACTS; } } _contactsPage.SetApplicationBarData(); }