Sets the z value for this connection, also updating the text item to 
        match the value if one is defined.
        
        :param      value | <int>

def setZValue(self, value):
        """
        Sets the z value for this connection, also updating the text item to 
        match the value if one is defined.
        
        :param      value | <int>
        """
        super(XNodeConnection, self).setZValue(value)

        if self._textItem:
            self._textItem.setZValue(value)