title: How to make ActivityIndicator overlay full screen?
body: <p>I have a <strong>StackLayout</strong> and a number of elements inside (buttons, texts etc).<br>
  I want the <strong>ActivityIndicator</strong> to overlay the entire screen and make it not able to do anything to those elements.<br>
  I have put <strong>ActivityIndicator</strong> inside the <strong>StackLayout</strong> but wrapped it with AbsoluteLayout thinking that AbsoluteLayout can easitly overlap everything:  </p>
  
  <pre><code>&lt;StackLayout&gt;
      &lt;AbsoluteLayout&gt;
          &lt;ActivityIndicator ... /&gt;
      &lt;/AbsoluteLayout&gt;
      &lt;...other elements...&gt; 
  &lt;/StackLayout&gt;
  </code></pre>
  
  <p>Instead activity indicator is displayed at the top of the StackLayout and other elements are available for affecting. I'm new in Xamarin and layouts, what am I doing wrong? All samples in the Internet have single ActivityIndicator per page...</p>