[Python] Subclass of tkinter's Toplevel class doesn't seem to inherit "tk" attribute

I'm writing a Python application using tkinter GUI. I created the TimestampWindow class which should be one of my Windows and made it extend the Toplevel class of tkinter's library and Window, a custom class where I put common attributes/methods for all my Windows. Unfortunately when I try to call self.title(...) on Window class (from a TimestampWindow instance) I get the following error:

File "/home/ela/elaPythonVirtualENV/PythonScripts/pgnclocker/pgnClocker/gui/windows/Window.py", line 54, in setUp
self.title(CommonStringsEnum.APP_NAME.value)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/tkinter/__init__.py", line 2301, in wm_title
return self.tk.call('wm', 'title', self._w, string)
^^^^^^^
AttributeError: 'TimestampWindow' object has no attribute 'tk'


Things doesn't change if I move the invocation of title method directly in TimestampWindow.

I leave two snippets with a "sketch" of TimestampWindow and Window classes below to clarify the whole thing:

Timestamp Window

import tkinter as tk
from pgnClocker.gui.windows.Window import *
... more imports ...

class TimestampWindow(tk.Toplevel, Window):

... code ...


Window

class Window:

... code ...

def setUp(self):
self.title(CommonStringsEnum.APP_NAME.value)


Could you please help me understand what's going on here? Shouldn't I be able to use TimestampWindow as a tkinter window since it inherits all methods from tk.Toplevel? Why it isn't inheriting tk attribute?

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