title: How to make Mac application respond to command tilde key shortcut to switch windows
body: <p>In most Mac applications it is possible to switch between the open windows of an application using the <code>cmd ~</code> key shortcut.
  I want this in my app too, but I really don't see how to implement.</p>
  
  <p>Most key shortcuts are implemented by adding a shortcut to one of the menu items. But for this one a menu item is not applicable. </p>