title: Qt Designer Menu Format Similar to 3D Slicer
body: <p>I need to re-create a section of a GUI used in 3D Slicer in Qt Designer, but I can't exactly pin down what I need to use to make this:</p>
  
  <p><img src="https://i.stack.imgur.com/OqPk4.png" alt="enter image description here"></p>
  
  <p>which turns into:</p>
  
  <p><img src="https://i.stack.imgur.com/88N2e.png" alt="enter image description here"></p>
  
  <p>I think that it's a drop-down menu that holds or acts as a container. This looks similar to a combo box, however the combo box cannot contain selection buttons that I would need in my application (at least to my knowledge). I think that it could possibly utilize a Tree Widget or List Widget, but I've looked through the Qt Design documentation and it doesn't mention anything similar, other than a combo box.</p>
  
  <p>Do you have any suggestions on this?</p>