1. Selected item (currently displayed view) should be always selected and never change styling
2. Clicked element in the first level menu should have styling only with a border see https://invis.io/HE12MIO28DA4 (the :active state)
3. When the user has the second menu collapsed and he changes the menu group (first level menu) the second menu should be expanded but only as long as he is hovering over the menu (if the user leaves the cursor from the menu the second level menu should collapse)
4. The separator in the popup menu when the second level is collapsed has the wrong styling - hover state and the margin bottom and top (see attached screenshot)