code: def _load_themes(self):
          
          with utils.temporary_chdir(utils.get_file_directory()):
              self._append_theme_dir("themes")
              self.tk.eval("source themes/pkgIndex.tcl")
              theme_dir = "gif" if not self.png_support else "png"
              self._append_theme_dir(theme_dir)
              self.tk.eval("source {}/pkgIndex.tcl".format(theme_dir))
          self.tk.call("package", "require", "ttk::theme::scid")
docs: Load the themes into the Tkinter interpreter