title: How to change the QCombobox highlight colour in PyQt
body: <p>I am having trouble changing the highlight colour of a QCombobox in PyQt. I have managed to change the highlight colour of the actual input box but when the drop down appears it is still blue. The following images shows what is exactly happening. The palette method works on Linux but not on Windows (what I am currently using).
  I used PyQt palette:</p>
  
  <pre><code>    brush = QtGui.QBrush(QtGui.QColor(168, 168, 168))
      brush.setStyle(QtCore.Qt.SolidPattern)
      palette.setBrush(QtGui.QPalette.Active, QtGui.QPalette.Highlight, brush)
      self.comboBox_7.setPalette(palette)
  </code></pre>
  
  <p>Here I managed to change the highlight colour to grey of the actual box:</p>
  
  <p><img src="https://i.imgur.com/660mB1L.jpg" alt="image1"></p>
  
  <p>but here the drop down highlight is still blue:</p>
  
  <p><img src="https://i.imgur.com/2RWxBqn.jpg" alt="image2"></p>
  
  <p>all help appreciated.</p>