docstr: Handler for clicking on key in basic settings list.
docstr_tok: ["Handler","for","clicking","on","key","in","basic","settings","list","."]
code: def final_key_selected(self, event=None):
      "Handler for clicking on key in basic settings list."
      self.build_key_string()
  
imports: from tkinter import Toplevel, Listbox, StringVar, TclError
  from tkinter.ttk import Frame, Button, Checkbutton, Entry, Label, Scrollbar
  from tkinter import messagebox
  from tkinter.simpledialog import _setup_dialog
  import string
  import sys
label_desc: Use image node_id 6 for calling the GetKeysFrame obj's underlying member method code with example usage: obj.final_key_selected(event) without return types