def OnSortAscending(self, event):
        """Sort ascending event handler"""

        try:
            with undo.group(_("Sort ascending")):
                self.grid.actions.sort_ascending(self.grid.actions.cursor)
            statustext = _(u"Sorting complete.")

        except Exception, err:
            statustext = _(u"Sorting failed: {}").format(err)

        post_command_event(self.grid.main_window, self.grid.StatusBarMsg,
                           text=statustext)
Sort ascending event handler