code: def trigger(self, *args, **kwargs):
      NavigationToolbar2GTK3.save_figure(
          self._make_classic_style_pseudo_toolbar()
      )
  
imports: import functools
  import logging
  import os
  from pathlib import Path
  import matplotlib
  from matplotlib import _api, backend_tools, cbook
  from matplotlib.backend_bases import ToolContainerBase, CloseEvent, KeyEvent, LocationEvent, MouseEvent, ResizeEvent
  from gi.repository import Gio, GLib, GObject, Gtk, Gdk
  from .None import _backend_gtk
  from ._backend_gtk import _BackendGTK, _FigureCanvasGTK, _FigureManagerGTK, _NavigationToolbar2GTK, TimerGTK
label_desc: Use image node_id 1 for calling the SaveFigureGTK3 obj's underlying member method code with example usage: obj.trigger() without return types