title: How to bind StringProperty to ObjectProperty<Integer> in JavaFX?
body: <p>I found only solution how to bind StringProperty to IntegerProperty, something like this: </p>
  
  <pre><code>StringProperty.bindBidirectional(IntegerProperty, new NumberStringConverter());
  </code></pre>
  
  <p>But I need also <code>null</code> value. How to bind <code>StringProperty to ObjectProperty&lt;Integer&gt;</code>?</p>