                            variable=self.slider_var,
                            command=self._on_slider_update)
          slider.pack(side=tk.RIGHT)
          logger.debug("Added scale slider: '%s'", slider)
          return slider
  
      def _add_interpolator_radio(self) -> None:
 
</s> remove         slider = tk.Scale(self,
 </s> add         slider = tk.Scale(self._frame, </s> remove         frame = tk.Frame(self)
 </s> add         frame = tk.Frame(self._frame) </s> remove         button = tk.Button(self,
 </s> add         button = tk.Button(self._frame,
        self._track_widget(slider)
                            variable=self.slider_var,
                            command=self._on_slider_update)
          slider.pack(side=tk.RIGHT)
        self._track_widget(slider)
          logger.debug("Added scale slider: '%s'", slider)
          return slider
  
      def _add_interpolator_radio(self) -> None:
keep keep add keep keep keep keep
 GUI - Preview updates
  - Training preview. Embed preview pop-out window
  - Bugfix - convert/extract previews 
lib/training/preview_tk.py