class_docstr: An implementation of BaseGUITestRunner using Tkinter.
      
class_docstr_tok: ["An","implementation","of","BaseGUITestRunner","using","Tkinter","."]
code: def showSelectedError(self):
      selection = self.errorListbox.curselection()
      if not selection:
          return
      selected = int(selection[0])
      txt = self.errorListbox.get(selected)
      window = tk.Toplevel(self.root)
      window.title(txt)
      window.protocol("WM_DELETE_WINDOW", window.quit)
      test, error = self.errorInfo[selected]
      tk.Label(
          window, text=str(test), foreground="red", justify=tk.LEFT
      ).pack(anchor=tk.W)
      tracebackLines = traceback.format_exception(*error)
      tracebackText = "".join(tracebackLines)
      tk.Label(window, text=tracebackText, justify=tk.LEFT).pack()
      tk.Button(window, text="Close", command=window.quit).pack(
          side=tk.BOTTOM
      )
      window.bind("<Key-Return>", lambda e, w=window: w.quit())
      window.mainloop()
      window.destroy()
  
imports: import sys
  import traceback
  import unittest
  import tkinter
  from tkinter import messagebox
  from tkinter import filedialog
  from tkinter import simpledialog
label_desc: Use image node_id 15 for calling the TkTestRunner obj's underlying member method code with example usage: obj.showSelectedError() without return types