title: Update shown field in combobox DisplayMemberPath not shown
body: <p>I have a wpf combobox. Its ItemsSource has binding to an ObservebaleCollection. The shown value (via DisplayMemberPath) is the Name property of the Entity class.
  The problem is when I update the current selected entity name and fire NotifyPropertyChnage it is not updated in the UI (even so that when I open the combo list it is updated there).
  I guess the problem is that the entity hashcode is still the same and the combo doesn't see a difference. what can I do?</p>
  
  <p>xaml:</p>
  
  <pre><code>&lt;ComboBox     ItemsSource="{Binding Entities, Mode=OneWay}" 
            SelectedItem="{Binding CurrentEntity}"
            DisplayMemberPath="Name"/&gt;
  </code></pre>
  
  <p>code:</p>
  
  <pre><code>    public event PropertyChangedEventHandler PropertyChanged;
  
      ObservableCollection&lt;Entity&gt; m_entities = new ObservableCollection&lt;Entity&gt;();
  
      public ObservableCollection&lt;Entity&gt; Entities{get{return m_entities;}} 
  
      public Entity CurrentEntity{get;set}
  
      public void RenameEntity(string name)
      {
      m_currentEntity.Name = name;
      PropertyChanged(this, new PropertyChangedEventArgs("CurrentEntity"));
      PropertyChanged(this, new PropertyChangedEventArgs("Entities"));
      }
  </code></pre>