docs: def canGoBack(self):
          """
          Returns whether or not this wizard can move forward.
  
          :return     <bool>
          """
          try:
              backId = self._navigation.index(self.currentId())-1
              if backId >= 0:
                  self._navigation[backId]
              else:
                  return False
          except StandardError:
              return False
          else:
              return True