Sets whether or not this delegate should draw its grid lines.
        
        :param      state | <bool>

def setShowGrid( self, state ):
        """
        Sets whether or not this delegate should draw its grid lines.
        
        :param      state | <bool>
        """
        delegate = self.itemDelegate()
        if ( isinstance(delegate, XTreeWidgetDelegate) ):
            delegate.setShowGrid(state)