title: How to show volume indicator when change system volume in code
body: <p>In my mac application, I change the system volume in code. I want the system volume indicator to appear that gives visual clue of how loud the sound is now.</p>
  
  <p><img src="https://i.stack.imgur.com/2w8M4.png" alt="enter image description here"></p>
  
  <p>I have searched through the Internet, but no lucky on me. And I can't detect this indicator using Accessibility Inspector. </p>