title: How to programmatically show focus visual of a control in mouse click
body: <p>When a certain control in my uwp app get focused (when it's <code>GotFocus</code> event is fired), I want to show it's focus visuals. Now, reading the doc, I know that by default it's set up to show only when using a controller or keyboard, but I also want to show it when a user focus on it by clicking on it, (or tapping on it in a touch device). 
  Is it possible?</p>
  
  <p>The focus visual works perfectly with Tab key of keyboard.</p>
  
  <p>I have set the <code>UseSystemFocusVisuals</code> to true.</p>
  
  <p>Thanks.</p>