title: Change visibility of one button by clicking another button
body: <p>I am trying to change visibility of two buttons when pressing one of them.</p>
  <p>So say I have an &quot;on&quot; and an &quot;off&quot; button. When I press the on button, I want the on button to hide itself and the off button to show, and vice versa.</p>
  <p>How could one do this?</p>