Tkinter, Windows: How to view window in windows task bar which has no title bar?

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Tk does not provide a way to have a toplevel window that has overrideredirect set to appear on the taskbar. To do this the window needs to have the WS_EX_APPWINDOW extended style applied and this type of Tk window has WS_EX_TOOLWINDOW set instead. We can use the python ctypes extension to reset this but we need to note that Tk toplevel windows on Windows are not directly managed by the window manager. We have therefore to apply this new style to the parent of the windows returned by the winfo_id method.

The following example shows such a window.

import tkinter as tk
import tkinter.ttk as ttk
from ctypes import windll

GWL_EXSTYLE = -20
WS_EX_APPWINDOW = 0x00040000
WS_EX_TOOLWINDOW = 0x00000080

def set_appwindow(root):
    hwnd = windll.user32.GetParent(root.winfo_id())
    style = windll.user32.GetWindowLongPtrW(hwnd, GWL_EXSTYLE)
    style = style & ~WS_EX_TOOLWINDOW
    style = style | WS_EX_APPWINDOW
    res = windll.user32.SetWindowLongPtrW(hwnd, GWL_EXSTYLE, style)
    # re-assert the new window style
    root.withdraw()
    root.after(10, root.deiconify)

def main():
    root = tk.Tk()
    root.wm_title("AppWindow Test")
    button = ttk.Button(root, text="Exit", command=root.destroy)
    button.place(x=10, y=10)
    root.overrideredirect(True)
    root.after(10, set_appwindow, root)
    root.mainloop()

if __name__ == '__main__':
    main()

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