Pane close toggle event handler (via close button)

def OnPaneClose(self, event):
        """Pane close toggle event handler (via close button)"""

        toggle_label = event.GetPane().caption

        # Get menu item to toggle
        menubar = self.main_window.menubar
        toggle_id = menubar.FindMenuItem(_("View"), toggle_label)
        toggle_item = menubar.FindItemById(toggle_id)

        # Adjust toggle to pane visibility
        toggle_item.Check(False)

        menubar.UpdateMenus()

        self.main_window._mgr.Update()

        event.Skip()