GUI3

from tkinter import *
from cekWin import *

class GUI3:
    def Read():
        ui = Tk()
        ui.title("Read")
        ui.geometry("400x400")
        frame1 = Frame(ui)
        frame1.pack()

        ui.protocol('WM_DELETE_WINDOW', lambda:GUI3.doSomething(ui))

        ui.mainloop()
    def doSomething(ui):
        global ui1
        global ui2
        global ui3

        ui3 = False

        ui.destroy()