Sets whether or not this widget is in isolation mode.  When in 
        isolation, only the selected node and its direct connections will be
        displayed.
        
        :param      state | <bool>

def setIsolationMode( self, state ):
        """
        Sets whether or not this widget is in isolation mode.  When in 
        isolation, only the selected node and its direct connections will be
        displayed.
        
        :param      state | <bool>
        """
        self._isolationMode = state
        self.updateIsolated(force = True)
        self.update()