  
          lbl.pack(side=tk.TOP, padx=5, pady=0, anchor=tk.CENTER)
          sep.pack(fill=tk.X, pady=(5, 0), side=tk.TOP)
  
      def _option_button_save(self):
          """ Action for save button press. """
          logger.debug("Saving File")
          savefile = FileHandler("save", "csv").return_file
          if not savefile:
              logger.debug("Save Cancelled")
 
</s> remove     def _opts_combobox(self, frame):
 </s> add     def _opts_combobox(self, frame: ttk.Frame) -> None: </s> remove     def _option_button_reload(self, *args):  # pylint: disable=unused-argument
        """ Action for reset button press and checkbox changes. """
 </s> add     def _option_button_reload(self, *args) -> None:  # pylint: disable=unused-argument
        """ Action for reset button press and checkbox changes.

        Parameters
        ----------
        args: tuple
            Required for TK Callback but unused
        """ </s> remove     def _opts_checkbuttons(self, frame):
 </s> add     def _opts_checkbuttons(self, frame: ttk.Frame) -> None: </s> remove     def _graph_scale(self, *args):  # pylint: disable=unused-argument
        """ Action for changing graph scale. """
 </s> add     def _graph_scale(self, *args) -> None:  # pylint: disable=unused-argument
        """ Action for changing graph scale.

        Parameters
        ----------
        args: tuple
            Required for TK Callback but unused
        """ </s> remove     def clear(self):
 </s> add     def clear(self) -> None:
    def _option_button_save(self) -> None:
  
          lbl.pack(side=tk.TOP, padx=5, pady=0, anchor=tk.CENTER)
          sep.pack(fill=tk.X, pady=(5, 0), side=tk.TOP)
  
    def _option_button_save(self) -> None:
          """ Action for save button press. """
          logger.debug("Saving File")
          savefile = FileHandler("save", "csv").return_file
          if not savefile:
              logger.debug("Save Cancelled")
keep keep keep keep replace keep keep keep keep keep
 Bugfixes:
  - Stats graph - Handle NaNs in data
  - logger - de-elevate matplotlib font messages 
lib/gui/popup_session.py