title: How to enable rotation in an Axes3D (matplotlib) embedded in a PyQt4 widget?
body: <p>I'm using the approach shown in the following questions for embedding an Axes3D in a PyQt4 widget:</p>
  
  <p><a href="https://stackoverflow.com/questions/4899176/qt4-mplot3d-of-matplotlib">Qt4 + mplot3d of matplotlib</a></p>
  
  <p>When starting the application, I can not rotate the axes via mouse movement anymore. What do I need to do to enable the rotation again?</p>