                        var=self.option.tk_var,
                        d_type=self.option.dtype,
                        round_to=self.option.rounding,
                        min_max=self.option.min_max)
          ctl = ttk.Scale(self.frame, variable=self.option.tk_var, command=cmd)
          _add_command(ctl.cget("command"), cmd)
          rc_menu = _get_contextmenu(tbox)
          rc_menu.cm_bind()
          ctl["from_"] = self.option.min_max[0]
          ctl["to"] = self.option.min_max[1]
 
</s> remove         self.set_styles()
 </s> add         self._cache = self.set_styles()
        ctl = ttk.Scale(self.frame,
                        variable=self.option.tk_var,
                        command=cmd,
                        style=f"{self._style}Horizontal.TScale")
                        var=self.option.tk_var,
                        d_type=self.option.dtype,
                        round_to=self.option.rounding,
                        min_max=self.option.min_max)
        ctl = ttk.Scale(self.frame,
                        variable=self.option.tk_var,
                        command=cmd,
                        style=f"{self._style}Horizontal.TScale")
          _add_command(ctl.cget("command"), cmd)
          rc_menu = _get_contextmenu(tbox)
          rc_menu.cm_bind()
          ctl["from_"] = self.option.min_max[0]
          ctl["to"] = self.option.min_max[1]
keep keep keep keep replace keep keep keep keep keep
 GUI fix - Make grey slider backgrounds go away 
lib/gui/control_helper.py