Tool event handler

def OnToggleTool(self, event):
        """Tool event handler"""

        config["check_spelling"] = str(event.IsChecked())
        toggle_id = self.parent.menubar.FindMenuItem(_("View"),
                                                     _("Check spelling"))
        if toggle_id != -1:
            # Check may fail if translation is incomplete
            toggle_item = self.parent.menubar.FindItemById(toggle_id)
            toggle_item.Check(event.IsChecked())

        self.parent.grid.grid_renderer.cell_cache.clear()
        self.parent.grid.ForceRefresh()

        event.Skip()