Finally, call the mainloop method root. It into the Tk event loop (event loop), so, the application will wait until the quit method is called (ie, click QUIT button), or the window was closed.

LabManual
.........\LabManual
.........\.........\Chap06
.........\.........\......\Age.cpp
.........\.........\......\Buggy.cpp
.........\.........\Chap07
.........\.........\......\payroll.txt
.........\.........\Chap09
.........\.........\......\PlayBall.txt
.........\.........\Chap10
.........\.........\......\cardList.txt
.........\.........\......\CreateList.cpp
.........\.........\......\PrizeList.txt
.........\.........\Chap11
.........\.........\......\CarLot.txt
.........\.........\......\employees.txt
.........\.........\......\GradeBook.txt
.........\.........\Chap16
.........\.........\......\states.txt
.........\.........\Chap17
.........\.........\......\invoice1.txt

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