title: Qt QToolBar get button added by addAction
body: <p>In Qt when we use the function <code>addAction</code> of a <code>QToolBar</code>:</p>
  
  <pre><code>_LastBar-&gt;addAction(QtExtensions::Action(name, icon, func));
  </code></pre>
  
  <p>How could we retrieve the <code>QToolButton</code> generated for that action?</p>
  
  <p>Or, if this is not possible, how to find the last button/widget of a <code>QToolBar</code>?</p>