class_docstr: Code stack viewer for debugger GUI.
docstr: Override base method.
docstr_tok: ["Override","base","method","."]
code: def on_double(self, index):
      "Override base method."
      self.show_source(index)
  
imports: import bdb
  import os
  from tkinter import *
  from tkinter.ttk import Frame, Scrollbar
  from idlelib import macosx
  from idlelib.scrolledlist import ScrolledList
  from idlelib.window import ListedToplevel
label_desc: Use image node_id 6 for calling the StackViewer obj's underlying member method code with example usage: obj.on_double(index) without return types