title: Issue Apple Store: non-public API "setMaximumLength, MaximumLength
body: <p>I'm having problems with the publication of an App on 'Apple Store; Apple has refused to publish the App because it found references to non-public APIs, specifically: "setMaximumLength :, MaximumLength". Unfortunately, analyzing the source code, I was not able to find the calls to these Apis. How can I solve this problem?</p>
  
  <p>--- APPLE MESSAGE ---</p>
  
  <ol start="2">
  <li>5 PERFORMANCE: SOFTWARE REQUIREMENTS
  Performance - 2.5.1</li>
  </ol>
  
  <p>Your app uses or references the following non-public APIs:</p>
  
  <p>setMaximumLength:, maximumLength</p>
  
  <p>The use of non-public APIs is not permitted on the App Store because it can lead to a poor user experience should these APIs change.</p>
  
  <p>--- END OF THE MESSAGE ---</p>
  
  <p>Versione XCode 8.0</p>
  
  <p>Versione Xamarin.Forms2.3.2.127</p>
  
  <p>Xamarin for Visual Studio 4.2</p>
  
  <p>Xamarin.iOS 10</p>