滚动条不会扩展到全屏

我需要向我的程序的一部分添加一个滚动条，因为他们希望它显示所有人，而不是另一部分只显示一个组。在查看 SC 时，大多数滚动条问题使用 Tkinter 而不是 tkinter 并使用包而不是网格。我遇到的问题是我的代码只在第一行的末尾创建了一个小滚动条。我尝试了不同的变体，sticky = E但它没有创建全屏滚动条。有人可以在课堂设置中使用 tkinter 和 grid 为我指出正确的方向吗？

    class ButtonClickSignin(Frame):

        def __init__(self):

            self.win2 = Tk()
            self.win2.title('Sign-In')
            self.win2['bg'] = 'blue'
            self.win2.geometry('635x635+200+100')
            center(self.win2)

            self.canvas = Canvas(self.win2)
            Frame.__init__(self, self.win2)
            self.frame = Frame(self.canvas)
            self.scrollbar = Scrollbar(self.win2, orient = VERTICAL)
            self.scrollbar.config(command = self.canvas.yview)
            self.scrollbar.grid(column = 5)
            self.canvas.config(yscrollcommand = self.scrollbar.set)
            self.canvas.create_window((0, 0), window = self.frame)
            self.win2.bind('<Configure>', self.onFrameConfigure)

            self.checkbuttons()

        def checkbuttons(self):
            filenames = ['grade_pk.txt', 'grade_kinder.txt', 'grade_one.txt',
                    'grade_two.txt', 'grade_three.txt', 'grade_four.txt',
                    'grade_five.txt', 'grade_six.txt', 'grade_seven.txt',
                    'grade_eight.txt', 'grade_drop_in.txt']
            with open('sign_in.txt', 'w') as outfile:
                for names in filenames:
                    with open(names) as infile:
                        outfile.write(infile.read())
            rw = 0  
            cl = 0
            file = open('sign_in.txt', 'r')

            for name in file:

                cb1 = Checkbutton(self.win2, text = name, onvalue = 1, offvalue = 0,
                            height = 2, width = 22, background = 'blue')
                cb1.grid(row = rw, column = cl, padx = 8, pady = 8)
                cl += 1
                if cl == 3:
                    cl = 0
                    rw += 1