CTk (tkinter.Tk)

Theoretically you could also use the normal tkinter.Tk class to create a window and place CTK widgets on it, but it is highly recommended to use the cuatomtkinter.CTk to create the window if you use CustomTkinter. Because only with the CTk window you get a dark window background and header which adapts to the dark/light mode set by customtkinter.set_appearance_mode(...).

Apart from the changing background and header color, the CTk class behaves exactly like the tkinter.Tk class.

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Example Code:

root_tk = customtkinter.CTk()
root_tk.geometry(f"{600}x{500}")
root_tk.title("CTk example")

... program ...

root_tk.mainloop()

class App(customtkinter.CTk)
    def __init__(self):
        super().__init__()

        self.geometry(f"{600}x{500}")
        self.title("CTk example")

        ... create widgets ...

    ... program methods ...

app = App()
app.mainloop()

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Arguments:

argument	value
bg_color or bg	tuple: (light_color, dark_color) or single color

and all arguments from tkinter.Tk

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Methods:

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>))

and all methods from tkinter.Tk