docs: def containerFor(self, entry):
          """
          Returns a container for the inputed entry widget.
          
          :param      entry | <XOrbQueryEntryWidget>
          
          :return     <XOrbQueryContainer> || None
          """
          try:
              index = self._compoundStack.index(entry)
          except ValueError:
              return None
          
          return self.widget(index + 1)