title: How to change the default button behaviour in a QDialog
body: <p>I read that <code>QDialog</code> has as default all its objects set as default. For example if I add a <code>QPushButton</code>:</p>
  
  <pre><code>pushButton.setDefault(True)   
  pushButton.setAutoDefaul(True)
  </code></pre>
  
  <p>I know that I can set each one as <code>False</code>, but is there a way of avoiding <code>QDialog</code> setting all its objects as default?</p>