title: PyQt4 menu acction to add new tab to QTabWidget
body: <p>I'm working on a small application for work w/ python and PyQt4 for the GUI. What I'm trying to accomplish is having a tabbed GUI where when a user clicks on a menu item, the action taken adds a tab to the QTabWidget. I'm currently having trouble getting an action to do such a thing. I've tried creating the GUI by hand and with QT designer, but I cant figure out how, if at all possible, to get an action to add a tab to the QTabWidget. This is my python code:</p>
  
  <pre><code>import sys
  from PyQt4 import QtGui, uic
  
  class TestGUI(QtGui.QMainWindow):
      def __init__(self):
          super(TestGUI, self).__init__()
          uic.loadUi('TEST.ui', self)
          self.show()
  
          self.actionAdd_Tab.triggered.connect(addTab)
  
  def addTab():
      print 'This works'
      #Add new tab to GUI
  
  if __name__ == '__main__':
      app = QtGui.QApplication(sys.argv)
      window = TestGUI()
      sys.exit(app.exec_())
  </code></pre>
  
  <p>Pressing the menu item prints 'This works' to the console, so I know that its calling the addTab() function, but how do I get it to add a Tab?</p>
  
  <p>Let me know if you would like to see the .ui file if it will help</p>