I'm trying to break away from having all my widgets and my main window in one user interface file. So in the example below I've created a frame that I want to show up in the main window. Later on I will show and hide it along with other frames etc. It pops up but in its own window and only briefly. What am I doing wrong? How do I get the QFrame UI file I created in Qt Designer to behave like what I would expect? That is to say a frame and not frame inside a window? I've excluded the boilerplate code that pyuic4 generates.

myApp.py:

Qt Code: 
  1. import sys
  2. from PyQt4 import QtCore, QtGui
  3. from main_window import Ui_MainWindow
  4. from frame2 import Frame
  5.  
  6. class StartQt4(QtGui.QMainWindow, Ui_MainWindow):
  7.     def __init__(self):
  8.         super(self.__class__, self).__init__()
  9.         self.setupUi(self)
  10.         myFrame = Frame()
  11.         myFrame.show()
  12.  
  13. if __name__ == "__main__":
  14.     app = QtGui.QApplication(sys.argv)
  15.     mainWin = StartQt4()
  16.     mainWin.show()
  17.     sys.exit(app.exec_())
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main_window.py:
Qt Code: 
  1. class Ui_MainWindow(object):
  2.     def setupUi(self, MainWindow):
  3.         MainWindow.setObjectName(_fromUtf8("MainWindow"))
  4.         MainWindow.resize(640, 480)
  5.         self.centralwidget = QtGui.QWidget(MainWindow)
  6.         self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
  7.         self.label = QtGui.QLabel(self.centralwidget)
  8.         self.label.setGeometry(QtCore.QRect(155, 45, 146, 81))
  9.         self.label.setObjectName(_fromUtf8("label"))
  10.         MainWindow.setCentralWidget(self.centralwidget)
  11.         self.statusbar = QtGui.QStatusBar(MainWindow)
  12.         self.statusbar.setObjectName(_fromUtf8("statusbar"))
  13.         MainWindow.setStatusBar(self.statusbar)
  14.  
  15.         self.retranslateUi(MainWindow)
  16.         QtCore.QMetaObject.connectSlotsByName(MainWindow)
  17.  
  18.     def retranslateUi(self, MainWindow):
  19.         MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
  20.         self.label.setText(_translate("MainWindow", "Main Window without menu bar", None))
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frame2.py:

Qt Code: 
  1. class Ui_Frame(object):
  2.     def setupUi(self, Frame):
  3.         Frame.setObjectName(_fromUtf8("Frame"))
  4.         Frame.resize(320, 240)
  5.         Frame.setFrameShape(QtGui.QFrame.Box)
  6.         Frame.setFrameShadow(QtGui.QFrame.Plain)
  7.         Frame.setLineWidth(8)
  8.         self.label = QtGui.QLabel(Frame)
  9.         self.label.setGeometry(QtCore.QRect(100, 60, 141, 76))
  10.         self.label.setObjectName(_fromUtf8("label"))
  11.  
  12.         self.retranslateUi(Frame)
  13.         QtCore.QMetaObject.connectSlotsByName(Frame)
  14.  
  15.     def retranslateUi(self, Frame):
  16.         Frame.setWindowTitle(_translate("Frame", "Frame", None))
  17.         self.label.setText(_translate("Frame", "This is the frame", None))
  18.  
  19. class Frame(QtGui.QFrame, Ui_Frame):
  20.     def __init__(self, parent=None, f=QtCore.Qt.WindowFlags()):
  21.         QtGui.QFrame.__init__(self, parent, f)
  22.  
  23.         self.setupUi(self)
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