title: How to get screen size in Firemonkey FM3?
body: <p>How to get screen dimensions with Firemonkey FM³ ? The following code:</p>
  
  <pre><code>var
    Size: TPointF;
  begin
    Size := FMX.Platform.IFMXScreenService.GetScreenSize;
    ...
  end;
  </code></pre>
  
  <p>Results in this compiler error:</p>
  
  <pre class="lang-none prettyprint-override"><code>[dcc32 Error] Unit1.pas(46): E2018 Record, object or class type required
  </code></pre>
  
  <p>How should I use <code>IFMXScreenService</code> interface to get screen size ?</p>