title: Nativescript behavior of the '< Go Back' button
body: <p>I've got the following ActionBar definition</p>
  
  <p><code>&lt;ActionBar class="action-bar" title="Settings"&gt;
           &lt;NavigationButton text="Go Back" android.systemIcon="ic_menu_back" tap="onBackTap"/&gt;
  &lt;/ActionBar&gt;</code></p>
  
  <p>The Android version does get called.</p>
  
  <p>In the iOS version - the onBackTap method is never called.</p>
  
  <p>Also it seems in iOS version, even if the NavigationButton entry is not there, {N} inserts one automatically.</p>