title: Add a click on QLineEdit
body: <p>I am working on set a click() event to QLineEdit, I already successfully did it. But I want to go back to Mainwindow when the QLine Edit is clicked because I need the data in Mainwindow to further process the data. But I failed to let it go back, neither nor to cite the Mainwindow as parent, I hope someone can point it out. Thank you so much.</p>
  
  <pre><code>MainWindow
  {
  
  ...
  
  
  self.tc = MyLineEdit(self.field[con.ConfigFields.VALUE])#self.tc = wx.TextCtrl(self.parent, -1, str(field[con.ConfigFields.VALUE]), pos=(x+220, y-3), size=(200, -1))
  
  ...
  
  }
  
  
  class MyLineEdit(QtGui.QLineEdit):
  
      def __init__(self, parent=MainWindow):
          super(MyLineEdit, self).__init__(parent)
          #super(CustomQLineEidt, self).__init__()
  
  
      def mousePressEvent(self, e):
          self.mouseseleted()
  
      def mouseseleted(self):
          print "here"
          MainWindow.mousePressEvent
  </code></pre>