docs: def findReference(self, name, cls=QtGui.QWidget):
          """
          Looks up a reference from the widget based on its object name.
          
          :param      name | <str>
                      cls  | <subclass of QtGui.QObject>
          
          :return     <QtGui.QObject> || None
          """
          ref_widget = self._referenceWidget
          if not ref_widget:
              return None
          
          if ref_widget.objectName() == name:
              return ref_widget
          return ref_widget.findChild(cls, name)