title: How can I set popover title bar color to the same as default navigationBar?
body: <p>I have some buttons on popover title bar, they are in dark color, so that I want to the popover title bar color can be changed to the same as Navigation Bar color, what can I do? You will see the gray title bar in popover, how can I do it?</p>
  
  <p><img src="https://i.stack.imgur.com/vPWK6.jpg" alt="alt text">
  <img src="https://i.stack.imgur.com/alCXI.jpg" alt="alt text"></p>