Open a window inside another window

[passerb]

I tried this by this way: (I'm using PyQt4)

- I generated a MainWindow using Qt Design with a widget object where I want to load another widget

- I generated a Widget using Qt Design with a simple button

Like this:

#class widget that I want to be loaded

class a(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        self.btModificar = QtGui.QPushButton(self.centralwidget)
        self.btModificar.setGeometry(QtCore.QRect(280, 40, 91, 21))
        self.toolBox.setCurrentIndex(0)

class a(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        self.btModificar = QtGui.QPushButton(self.centralwidget)
        self.btModificar.setGeometry(QtCore.QRect(280, 40, 91, 21))
        self.toolBox.setCurrentIndex(0)

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#class that I want to load the widget

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btAdicionar = QtGui.QPushButton(self.centralwidget)
        self.btAdicionar.setGeometry(QtCore.QRect(90, 40, 91, 21))
        self.btAdicionar.setObjectName("btAdicionar")
        self.widget = QtGui.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(160, 105, 811, 471))
        self.widget.setObjectName("widget")
        MainWindow.setCentralWidget(self.centralwidget)
        QtCore.QObject.connect(self.btAdicionar, QtCore.SIGNAL("clicked()"), MainWindow.adicionar)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btAdicionar = QtGui.QPushButton(self.centralwidget)
        self.btAdicionar.setGeometry(QtCore.QRect(90, 40, 91, 21))
        self.btAdicionar.setObjectName("btAdicionar")
        self.widget = QtGui.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(160, 105, 811, 471))
        self.widget.setObjectName("widget")
        MainWindow.setCentralWidget(self.centralwidget)
        QtCore.QObject.connect(self.btAdicionar, QtCore.SIGNAL("clicked()"), MainWindow.adicionar)

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# thats the class that implements the Ui_MainWindow

class MainWindow (QMainWindow, Ui_MainWindow):
 
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
 
    def adicionar(self):
        # here I want to load that widget named a
        # I tried this:        
        # aa = a()
        # self.widget.setParent(aa)
        # self.widget.show()
        # but it didnt work

class MainWindow (QMainWindow, Ui_MainWindow):
    
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
             
    def adicionar(self):
        # here I want to load that widget named a
        # I tried this:        
        # aa = a()
        # self.widget.setParent(aa)
        # self.widget.show()
        # but it didnt work

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