title: PyQt: Show menu in a system tray application
body: <p>First of all, I'm an experienced C programmer but new to python. I want to create a simple application in python using pyqt. Let's imagine this application it is as simple as when it is run it has to put an icon in the system tray and it has offer an option in its menu to exit the application.</p>
  
  <p>This code works, it shows the menu (I don't connect the exit action and so on to keep it simple)</p>
  
  <pre><code>import sys
  from PyQt4 import QtGui
  
  def main():
      app = QtGui.QApplication(sys.argv)
  
      trayIcon = QtGui.QSystemTrayIcon(QtGui.QIcon("Bomb.xpm"), app)
      menu = QtGui.QMenu()
      exitAction = menu.addAction("Exit")
      trayIcon.setContextMenu(menu)
  
      trayIcon.show()
      sys.exit(app.exec_())
  
  if __name__ == '__main__':
      main()
  </code></pre>
  
  <p>But this doesn't:</p>
  
  <pre><code>import sys
  from PyQt4 import QtGui
  
  class SystemTrayIcon(QtGui.QSystemTrayIcon):
  
      def __init__(self, icon, parent=None):
          QtGui.QSystemTrayIcon.__init__(self, icon, parent)
          menu = QtGui.QMenu()
          exitAction = menu.addAction("Exit")
          self.setContextMenu(menu)
  
  def main():
      app = QtGui.QApplication(sys.argv)
  
      trayIcon = SystemTrayIcon(QtGui.QIcon("Bomb.xpm"), app)
  
      trayIcon.show()
      sys.exit(app.exec_())
  
  if __name__ == '__main__':
      main()
  </code></pre>
  
  <p>I probably miss something. There are no errors but in the second case when I click with the right button it doesn't show the menu.</p>