Enters a new container for the given entry widget.
        
        :param      entry | <XOrbQueryEntryWidget> || None

def enterContainer(self, entry, query):
        """
        Enters a new container for the given entry widget.
        
        :param      entry | <XOrbQueryEntryWidget> || None
        """
        self._compoundStack.append(entry)
        self.addContainer(query)