title: The name 'NotifyOfPropertyChange' does not exist in the current context
body: <p>I'm getting an error on the following piece of code:</p>
  
  <pre><code>public class PathSelectionPageViewModel : ObservableObject, INavigable, INotifyPropertyChanged
  {
      private DriveInfo driveSelection;
      public DriveInfo DriveSelection_SelectionChanged
      {
          get
          {
              return driveSelection;
          }
          set
          {
  
              if (value == driveSelection) return;
              driveSelection = value;
              NotifyOfPropertyChange(() =&gt; DriveSelection_SelectionChanged);//must be implemented
          }
  
      }
  }
  </code></pre>
  
  <p>I'm getting the error <code>NotifyOfPropertyChange Does not exists in current context</code>. All usings are ok; I checked similiar questions and found no answer. Any suggestion onwhy it can not find the <code>NotifyOfPropertyChange</code>?</p>