Databound UI Not Updating - windows-phone-8

Question

I have implemented an ObserveableCollection of "Contact" Objects on a page and set it as the itemsource for a longlistselector. All the properties of the "Contact" Objects implement INotifyPropertyChanged. The List and properties display fine once they are added to the ObserveableCollection. However, whenever I change one of the properties in code the change is not reflected in the UI till I leave the page and return. Therefore the databound properties don't update in realtime.
From XAML Page:
public ObservableCollection<Contact> contacts = new ObservableCollection<Contact>();
Contact[] data = ContactHandler.Singleton().GetContacts().Values.OrderBy(x => x.DisplayName.ToLower()[0]).ToArray();
int dataCount = data.Length;
this.LayoutRoot.Dispatcher.BeginInvoke(() =>
{
for (int x = 0; x < data.Length; x++)
{
contacts.Add(data[x]);
}
});
Here is where I Update the "Highlight" property of the "contacts":
private void contactList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Contact contact = contactList.SelectedItem as Contact;
if (contact != null)
{
Debug.WriteLine(contact.DisplayName + " is: " + contact.Highlight);
string uid = contact.UserID;
if (uids.Contains(uid))
{
uids.Remove(uid);
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
contact.Highlight = Visibility.Collapsed;
});
}
else
{
uids.Add(uid);
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
contact.Highlight = Visibility.Visible;
});
}
}

Answer 1

Ok, so I'm an idiot.
Lession learned. Never forget to have your object in the collection (in my case Contact) inherit from INotifyPropertyChanged. I was implementing it but not inheriting.