How Do I Connect My Check Box To Button In Pyqt4?

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Python

checkbox

buttons

Python2.7

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I'm building an application in which a check box is connected to a button and the button only gets activated when the check box is marked. I have the button and check box defined in initUI function and i have created a button hide function which ive connected to my check box, but i keep getting an error that 'qbtn'(my button) is not defined. What should i do?

initUI:

def initUI(self):   
                       
         # Add push button       
        qbtn = QtGui.QPushButton('Quit', self)
        #connect to button press
        qbtn.clicked.connect(self.ButtonPress)
        qbtn.resize(qbtn.sizeHint())
         
        qbtn.move(50, 50)
        #Add Check Box
        cb = QtGui.QCheckBox('Agree', self)
        cb.move(20, 20)
        cb.toggle()
        cb.stateChanged.connect(self.ButtonHide)   

ButtonHide:

def ButtonHide(self, state):
                       
            if state == QtCore.Qt.Checked:
                qbtn.setEnabled(True) 
            else:
                qbtn.setEnabled(False) 

Error Message:

File "<wingdb_compile>", line 46, in ButtonHide
NameError: global name 'qbtn' is not defined
Traceback (most recent call last):

Thanks!