title: QGroupBox find selected Radio Button
body: <p>I have created a simple UI consisting of a <code>QGroupBox</code> with a bunch of <code>QRadioButtons</code> (32 to be exact) and I want to be able to find the selected one.</p>
  
  <p>I've looked at forums and things, but the answers I've found don't work, and one referenced documentation on a nonexistant method of <code>QGroupBox</code>.</p>
  
  <p>Given the below snippet, how would I find the selected <code>QRadioButton</code>, if any?</p>
  
  <pre><code>QGroupBox* thingGroup = ui-&gt;thingGroupBox;
  </code></pre>