title: How to show braintree user interface in codename one
body: <p>How do I display the UI of the braintree in codename one?  I only  have this code `    </p>
  
  <pre><code>Purchase.startOrder(new Purchase.Callback() {
      public String fetchToken() {
  
  
  
      }
  
      public void onPurchaseSuccess(String nonce) {
  
      }
  
      public void onPurchaseFail(String errorMessage) {
  
      }
  
      public void onPurchaseCancel() {
  
      }
  });`
  </code></pre>
  
  <p>pls, I need a guide here. thanks</p>