title: Purpose of "base.OnNavigatedTo(e)" inside of the OnNavigatedTo override method?
body: <p>When overriding the OnNavigatedTo method in a page they place this line of code inside:</p>
  
  <pre><code>base.OnNavigatedTo(e);
  </code></pre>
  
  <p>I've been removing it and have not noticed any odd behavior. What is this line of code for? Are we supposed to leave it? Or is this like a place holder?</p>
  
  <p>I'm pretty sure this isn't specific to the method itself, as I have seen this in different places. My guess is that this calls the default OnNavigatedTo method from the from the class that we are inheriting from (in this case Page). Its existence doesn't really make sense though, because if we wanted that why override it in the first place? Can someone explain how this works?</p>