title: QToolBox: how to have multiple items visible at the same time
body: <p>So far my QToolBox only alows me to have one element open/visible at the time.</p>
  <p>How can the following be achieved? Is it possible by using a QToolBox?:
  Please see the image, the arrows show what I mean.</p>
  <p><a href="https://i.stack.imgur.com/AU73I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AU73I.png" alt="Desired effect" /></a></p>