title: focus() not working after Popover closed in material ui
body: <p>I can't figure out why I can't programmatically focus an input html element (part of a Material UI TextField) once I've opened a Popover that steals the focus. I can programmatically focus before I open the Popover but once I close it then I can no longer programmatically focus the input element that belongs to the Textfield.</p>
  
  <p>Can someone help me? I’m not able to use autoFocus on the Textfield because I’ve built it as part of a grid so I need a way to force focus programmatically back to the Textfield</p>
  
  <p>Thanks,</p>
  
  <p>Adam </p>