import tkinter as tk from windowmanager import WindowManager root = tk.Tk() # root.withdraw() # initialise WindowManager win_man = WindowManager(root) # Create a new window win_man.new_window("testpopup") # Adding items to new window testwindow = win_man.window_dict["testpopup"][1] button = tk.Button(testwindow, text="test text here", command=lambda c="testpopup": win_man.close_window(c)) button.pack() root.mainloop()