title: Is there a way to specify a custom dependency property's default binding mode and update trigger?
body: <p>I would like to make it so that, as default, when I bind to one of my dependency properties the binding mode is two-way and update-trigger is property changed. Is there a way to do this?</p>
  
  <p>Here is an example of one of my dependency properties:</p>
  
  <pre><code>public static readonly DependencyProperty BindableSelectionLengthProperty =
          DependencyProperty.Register(
          "BindableSelectionLength",
          typeof(int),
          typeof(ModdedTextBox),
          new PropertyMetadata(OnBindableSelectionLengthChanged));
  </code></pre>