Okay... This has been bugging me for hours. I have a qtmainwindow with a menubar. I've managed to connect an action in tje menubar to an independent Qwidget. But as soon as the Qwidget appears it disappears. I'm using the latest version of pyqt.

Here's the code:

Import sys
from PyQt4  import QtGui,  QtCore

Class Main(QtGui.QtMainWindow) :
         def __init__(self) :
               QtGui.QtMainWindow.__init__(self) 
               self.setGeometry(300,300,240,320) 
               self.show() 

               menubar  = self. menuBar() 

               filemenu = menubar. addMenu('&File') 

               new = QtGui.QAction(QtGui.QIcon('new.png'), 'New', self) 
               new.triggered.connect(self.pop) 
               filemenu.addAction(new) 

      def pop(self) :
            pop = Pop() 

class Pop(QtGui.QWidget) :
         def __init__(self) :
               QtGui.QWidget.__init__(self) 
              self.setGeometry(300,300,240,320>
              self.setWindowTitle('Pop up') 
             self.show()