def __init__(self, widget : QtGui.QWidget, text: str):
     err = "{0} ({1}): {2}".format(widget.objectName(), 
                                   widget.metaObject().className(), text)
     Exception.__init__(self, err)
 def __IsRadioBtn(self, obj : QtGui.QWidget) -> bool:
     return obj.metaObject().className() == 'QRadioButton'