title: Unity - Buttons won't highlight on change
body: <p>I setup a small menu with 4 buttons. When I start the scene the first button gets selected by script and is shown highlighted. Now I can move through the menu with the keyboard and every button works as it should, but the first button stays highlighted and when I select another button it doesn't get highlighted.</p>
  
  <p>The current UI menu is the fourth one in my game and every other menu works just fine and I made this menu the same way like the others. But there has to be something I'm missing. Maybe this sound familiar to someone?</p>
  
  <p>The buttons are setup correctly and every button has it's highlight color set. I tryed to set the first selected button with the event system in the inspector, but that doesn't change anything.</p>
  
  <p><a href="https://i.stack.imgur.com/gv5zN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gv5zN.png" alt="enter image description here"></a></p>