title: Exrin: How to setup two way binding between VisualState and ModelState
body: <p>How is the binding between <code>ModelState</code> and <code>VisualState</code> changed from one way to two way?</p>
  
  <p>In the <a href="https://www.youtube.com/watch?v=VCmetoNpL4M" rel="nofollow noreferrer">Exrin introduction on YouTube</a> and in <a href="https://stackoverflow.com/a/44170915/5245420">this SO answer</a>, it is stated that there is a binding between the <code>ModelState</code> and the <code>VisualState</code> (specifically <code>ModelState</code> -> <code>VisualState</code>). It is also stated that the binding can be changed from one way to two way.</p>
  
  <p>I did some looking around and did find a <code>BindingType</code> enum with the values being <code>OneWay</code> and <code>TwoWay</code>, but I was unable to find where to utilize these.</p>