known subclasses: kiwi.ui.widgets.checkbutton.CheckButton
| Function | __init__ | Undocumented |
| Function | do_toggled | Undocumented |
| Function | read | Get the content of the widget. |
| Function | update | Update the content value of the widget. |
Get the content of the widget. The type of the return value
Update the content value of the widget.