title: WPF Data Binding - Example of "Custom Type Descriptor"
body: <p>I see several people saying that WPF can use "Custom Type Descriptors" for "Change notification".</p>
  
  <p>The ways I know how to do Change Notification are:</p>
  
  <pre><code>object.GetBindingExpression(Bound.property).UpdateTarget();
  </code></pre>
  
  <p>Or have my object implement <code>INotifiyPropertyChanged</code>.</p>
  
  <p>I see comments saying that Custom Type Descriptors will work too, but no one gives a good example on how it works.  I am now asking for that example (IE a good example of WPF Data Binding and updating via Custom Type Descriptors.)</p>