def OnNodeSelected(self, event):
        """We have selected a node with the list control, tell the world"""
        try:
            node = self.sorted[event.GetIndex()]
        except IndexError, err:
            log.warn(_('Invalid index in node selected: %(index)s'),
                     index=event.GetIndex())
        else:
            if node is not self.selected_node:
                wx.PostEvent(
                    self,
                    squaremap.SquareSelectionEvent(node=node, point=None,
                                                   map=None)
                )
We have selected a node with the list control, tell the world