menu-item improvements

src/components/underlay.style.js

@@ -1,6 +1,9 @@
 export default {
   name: 'Underlay',
-  selector: 'body', // Should be '#content' but for now this is better for testing until I have proper popovers and such...
+  selector: '#content',
+  // Out of tree selector: Most components are laid over underlay, but underlay itself is not part of the DOM tree,
+  // i.e. it's a separate absolutely-positioned component, so we need to treat it differently depending on whether
+  // we are searching for underlay specifically or for whatever is laid on top of it.
   outOfTreeSelector: '.underlay',
   validInnerComponents: [
     'Panel'