Sets whether or not columns should be rendered when drawing the grid.
        
        :param      state | <bool>

def setShowGridColumns( self, state ):
        """
        Sets whether or not columns should be rendered when drawing the grid.
        
        :param      state | <bool>
        """
        delegate = self.itemDelegate()
        if ( isinstance(delegate, XTreeWidgetDelegate) ):
            delegate.setShowGridColumns(state)