title: How to bind to one element of an ObservableCollection
body: <p>I have an ObservableCollection and want to bind a Textbox to a specific element of that collection. The Items in the ObservableCollection are of a Type that implements INotifyPropertyChanged.</p>
  
  <p>I have thought about creating a Property that selects the right element from the ObservableCollection, but then I would have to make this Property realise when the corresponding element in the Collection changes and I am not sure if this is the right way to do this.</p>