# ... class Gui_Qt(QtGui.QMainWindow): def __init__(self, parent=None): super(Gui_Qt, self).__init__(parent) self.ui = Ui_MainWindow() self.ui.setupUi(self) self.centralwidget = QtGui.QWidget() self.customwidget = Ui_customWidget() self.customwidget.setupUi(self.centralwidget) self.setCentralWidget(self.centralwidget) # actions self.ui.actionExit.triggered.connect(self.on_actionExit_triggered) self.ui.actionAbout.triggered.connect(self.on_actionAbout_triggered) def on_actionExit_triggered(self): self.close() def on_actionAbout_triggered(self): QtGui.QMessageBox.about(self, "XML-RPC Currency Calculator", "© Rainer Poisel und Marcus Nutzinger, 2011") # ...