title: How to rotate sub-views around their own centres?
body: <p>Is it possible to rotate a view around its own centre?</p>
  
  <p>In my present implementation the sub-views (buttons, etc) seem to move along a funny path before they end up in the desired positions (since the super view's coordinate system is rotated). I would like the views to spin 90 degrees around theire own centres as in the picture below. </p>
  
  <p><img src="https://i.stack.imgur.com/LBi9w.png" alt="desired rotation"></p>