title: Pivot Header style
body: <p>C# UWP Windows 10 project</p>
  
  <p>I need to set Pivot header style to something like this <a href="https://i.stack.imgur.com/DC3OK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DC3OK.png" alt="enter image description here"></a></p>
  
  <p>I has tried to use this example from <a href="https://stackoverflow.com/questions/31797875/overriding-pivot-header-foreground-brushes-in-uwp-app-win-10-rtm-sdk">stackoverflow</a>, but not sucessful.</p>
  
  <p>Can you say how I can set rectangle (like on image) behind header text and change background color for selected unselected items?</p>