def update_widgets(self, new_frame=None):
        """
        Reset the values for any Widgets in this Layout based on the current Frame data store.

        :param new_frame: optional old Frame - used when cloning scenes.
        """
        for column in self._columns:
            for widget in column:
                # First handle the normal case - pull the default data from the current frame.
                if widget.name in self._frame.data:
                    widget.value = self._frame.data[widget.name]
                elif widget.is_tab_stop:
                    # Make sure every active widget is properly initialised, by calling the setter.
                    # This will fix up any dodgy NoneType values, but preserve any values overridden
                    # by other code.
                    widget.value = widget.value

                # If an old frame was present, give the widget a chance to clone internal state
                # from the previous view.  If there is no clone function, ignore the error.
                if new_frame:
                    try:
                        widget.clone(new_frame.find_widget(widget.name))
                    except AttributeError:
                        pass
Reset the values for any Widgets in this Layout based on the current Frame data store.

        :param new_frame: optional old Frame - used when cloning scenes.