text: Title: when I use is checked to get the listbox state ,porpmpt error
  Body: 
          listbox = dlg.ListBox
          print(listbox.items())
          item = listbox.get_item(field)
          if item.is_checked() == True:
              print("T")
          else:
              print("F")
  
  it show error  
  File "C:\Users\zou-45\AppData\Local\Programs\Python\Python311\Lib\site-packages\comtypes\__init__.py", line 274, in __getattr__
      fixed_name = self.__map_case__[name.lower()]
                   ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  KeyError: 'togglestate_on'
  