diff --git a/Readme.md b/Readme.md
index 83e8cb5..aa8f4c7 100644
--- a/Readme.md
+++ b/Readme.md
@@ -35,7 +35,7 @@ To test customtkinter you can try this simple example with only a single button:
 import tkinter
 import customtkinter  # <- import the CustomTkinter module
 
-root_tk = tkinter.Tk()  # create the Tk window like you normally do
+root_tk = customtkinter.CTk()  # create CTk window like you do with the Tk window (you can also use normal tkinter.Tk window)
 root_tk.geometry("400x240")
 root_tk.title("CustomTkinter Test")
 
@@ -69,23 +69,25 @@ button = customtkinter.CTkButton(master=root_tk,
 button.place(relx=0.5, rely=0.5, anchor=tkinter.CENTER)
 ```
 
-### How to use macOS dark mode?
-If you have a python version with Tcl/Tk >= 8.6.9, then you can enable the macOS
-darkmode. Currently only the anaconda python versions have Tcl/Tk >= 8.6.9.
-So if you want a dark window titlebar, you have to install anaconda python version
+### Dark mode and dark title-bar on macOS
+If you have a python version with Tcl/Tk >= 8.6.9, then you automatically get
+a dark title bar with macOS dark-mode on, if you use the `customtkinter.Ctk` class to create
+the window instead of the normal `tkinterTk` class. Currently, only the anaconda python versions have Tcl/Tk >= 8.6.9.
+So if you want a dark window title-bar, you have to install anaconda python version
 or miniconda.
 ```python
 import tkinter
 import customtkinter
 
-customtkinter.enable_macos_darkmode()
 customtkinter.set_appearance_mode("System")
+root_tk = customtkinter.CTk()
 
 ... the program ...
 
-customtkinter.disable_macos_darkmode()
+root_tk.mainloop()
+
 ```
-which gives the following with the above simple button program:
+The above results in a window with a black title-bar with macOS dark-mode turned on:
 
 ![](documentation_images/simple_macOS_darkmode_test.png)
 
@@ -96,14 +98,14 @@ the System mode:
 
 ### Advanced example with multiple CTkFrames
 
-Here I used the ``customtkinter.enable_macos_darkmode()`` command to
-enable the macOS darkmode, and used multpiple CTkFrames. It has some
+Here I used the ``customtkinter.CTk()`` class to create the main window with two CTkFrame's and 
+set the appearance mode to `System`. It has some
 kind of a menu on the left side, and I used all CustomTkinter elements
 there are at the moment.Maybe this is a good reference if you want to
 create your own application with this library.
 (Code: /complex_example.py)
 
-With macOS darkmode turned on, it looks like this:
+With macOS dark-mode turned on, it looks like this:
 
 ![](documentation_images/complex_example_dark.png)
 
@@ -147,6 +149,37 @@ created two buttons with a bell and a settings image on them:
 
 ## Documentation - CustomTkinter Elements
 
+### CTk
+You can use the normal ``kinter.Tk`` class to create the root window,
+but if you want a background color that changes with the appearance mode and a dark title-bar on macOS,
+you should use the `customtkinter.CTk` class which behaves exactly like the normal Tk
+class, except that you can also set a tuple color as bg color.
+
+Example Code:
+
+```python
+root_tk = customtkinter.CTk()
+
+... program ...
+
+root_tk.mainloop()
+```
+<details>
+<summary>Show all arguments:</summary>
+
+argument | value
+--- | ---
+bg_color or bg | tuple: (light_color, dark_color) or single color
+
+CTk Methods:
+
+```python
+root_tk = customtkinter.CTk()
+# configure bg color with single or tuple color
+root_tk.configure(bg_color="gray20")
+root_tk.configure(bg_color=(<light-mode color>, <dark-mode color>))
+```
+
 ### CTkButton
 Examle Code:
 ```python
diff --git a/customtkinter/__init__.py b/customtkinter/__init__.py
index 83afb93..fe92d2b 100644
--- a/customtkinter/__init__.py
+++ b/customtkinter/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "1.5"
+__version__ = "1.6"
 
 from .customtkinter_button import CTkButton
 from .customtkinter_slider import CTkSlider
diff --git a/customtkinter/appearance_mode_tracker.py b/customtkinter/appearance_mode_tracker.py
index 8dd1872..39481f8 100644
--- a/customtkinter/appearance_mode_tracker.py
+++ b/customtkinter/appearance_mode_tracker.py
@@ -119,6 +119,10 @@ class AppearanceModeTracker():
     def add(cls, callback):
         cls.callback_list.append(callback)
 
+    @classmethod
+    def remove(cls, callback):
+        cls.callback_list.remove(callback)
+
     @classmethod
     def get_mode(cls):
         return cls.appearance_mode
@@ -141,10 +145,19 @@ class AppearanceModeTracker():
 
         if cls.appearance_mode == 0:
             for callback in cls.callback_list:
-                callback("Light")
+                try:
+                    callback("Light")
+                except Exception:
+                    print("error callback")
+                    continue
+
         elif cls.appearance_mode == 1:
             for callback in cls.callback_list:
-                callback("Dark")
+                try:
+                    callback("Dark")
+                except Exception:
+                    print("error callback")
+                    continue
 
 
 AppearanceModeTracker.init_listener_function()
diff --git a/customtkinter/customtkinter_button.py b/customtkinter/customtkinter_button.py
index 4610ebc..eaa47d0 100644
--- a/customtkinter/customtkinter_button.py
+++ b/customtkinter/customtkinter_button.py
@@ -101,6 +101,10 @@ class CTkButton(tkinter.Frame):
         self.bind('<Configure>', self.update_dimensions)
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.set_appearance_mode)
+        super().destroy()
+
     def configure_basic_grid(self):
         # Configuration of a basic grid (2x2) in which all elements of CTkButtons are centered on one row and one column
         self.grid_rowconfigure(0, weight=1)
diff --git a/customtkinter/customtkinter_checkbox.py b/customtkinter/customtkinter_checkbox.py
index 74f1b41..08b8e11 100644
--- a/customtkinter/customtkinter_checkbox.py
+++ b/customtkinter/customtkinter_checkbox.py
@@ -91,6 +91,10 @@ class CTkCheckBox(tkinter.Frame):
 
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.set_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_entry.py b/customtkinter/customtkinter_entry.py
index 9acf6e7..af2009f 100644
--- a/customtkinter/customtkinter_entry.py
+++ b/customtkinter/customtkinter_entry.py
@@ -54,6 +54,10 @@ class CTkEntry(tkinter.Frame):
 
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.change_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_frame.py b/customtkinter/customtkinter_frame.py
index 6874aee..403e3ba 100644
--- a/customtkinter/customtkinter_frame.py
+++ b/customtkinter/customtkinter_frame.py
@@ -58,6 +58,10 @@ class CTkFrame(tkinter.Frame):
 
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.change_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_label.py b/customtkinter/customtkinter_label.py
index fa54bc6..55f92ac 100644
--- a/customtkinter/customtkinter_label.py
+++ b/customtkinter/customtkinter_label.py
@@ -69,6 +69,10 @@ class CTkLabel(tkinter.Frame):
 
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.change_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_progressbar.py b/customtkinter/customtkinter_progressbar.py
index 003882e..7bfe37c 100644
--- a/customtkinter/customtkinter_progressbar.py
+++ b/customtkinter/customtkinter_progressbar.py
@@ -46,6 +46,10 @@ class CTkProgressBar(tkinter.Frame):
         # set progress
         self.set(self.value)
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.change_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_slider.py b/customtkinter/customtkinter_slider.py
index 9e2a818..18fa482 100644
--- a/customtkinter/customtkinter_slider.py
+++ b/customtkinter/customtkinter_slider.py
@@ -64,6 +64,10 @@ class CTkSlider(tkinter.Frame):
 
         self.draw()
 
+    def destroy(self):
+        AppearanceModeTracker.remove(self.change_appearance_mode)
+        super().destroy()
+
     def detect_color_of_master(self):
         if isinstance(self.master, CTkFrame):
             return self.master.fg_color
diff --git a/customtkinter/customtkinter_tk.py b/customtkinter/customtkinter_tk.py
index 7112e4f..d49ccba 100644
--- a/customtkinter/customtkinter_tk.py
+++ b/customtkinter/customtkinter_tk.py
@@ -30,6 +30,7 @@ class CTk(tkinter.Tk):
         super().configure(bg=CTkColorManager.single_color(self.bg_color, self.appearance_mode))
 
     def destroy(self):
+        AppearanceModeTracker.remove(self.set_appearance_mode)
         self.disable_macos_dark_title_bar()
         super().destroy()
 
@@ -65,6 +66,4 @@ class CTk(tkinter.Tk):
         elif mode_string.lower() == "light":
             self.appearance_mode = 0
 
-        print("set",self.bg_color)
-
         super().configure(bg=CTkColorManager.single_color(self.bg_color, self.appearance_mode))
diff --git a/setup.py b/setup.py
index 9e46160..81f0f02 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ def read(filename):
 
 
 setup(name="customtkinter",
-      version="1.5",
+      version="1.6",
       author="Tom Schimansky",
       license="Creative Commons Zero v1.0 Universal",
       url="https://github.com/TomSchimansky/CustomTkinter",