tkinter的pack布局问题

用tkinter实现品字形布局，默认是这样：

点击“增加窗口”后实现这样的布局：

试了很久，总是错位，

   def __init__(self):
        super().__init__()
        # self.style = Style(self)
        self.style = ttk.Style()
        # self.style.theme_use()
        self.title("Object Detection")
        self.geometry(("%dx%d+0+0" % (self.winfo_screenwidth(), self.winfo_screenheight())))
        print(self.winfo_screenheight())
        self.image_frame_1 = ImageFrame(self, "拿货")#,int(self.winfo_screenheight() /2))
        self.image_frame_1.pack(side=tk.LEFT, anchor='nw',fill=tk.BOTH,expand=True)#fill=tk.X,

        self.image_frame_2 = ImageFrame(self, "退货")#,int(self.winfo_screenheight() /2))
        self.image_frame_2.pack(side=tk.RIGHT,anchor='ne',fill=tk.BOTH,expand=True)# fill=tk.BOTH,
        # 中间的Canvas中显示统计结果
        # self.labelframe = ttk.Labelframe(self, text="Labelframe")
        self.Middle_frame = tk.Canvas(self , width=600,height=1200)#text="统计",
        self.Middle_frame.pack(side=tk.BOTTOM, fill=tk.BOTH, expand=True)
        self.image_frame_1_1 = ImageFrame(self, "拿货", int(self.winfo_screenheight() / 2))
        self.image_frame_1_1.pack(side=tk.LEFT, fill=tk.X, anchor='sw', expand=True)
        self.vbar = ttk.Scrollbar(self.Middle_frame, orient="vertical", command=self.Middle_frame.yview)
        self.vbar.grid(row=0, column=31, sticky="ns",rowspan=500)
        self.Middle_frame.configure(yscrollcommand=self.vbar.set)
        self.Middle_frame.bind("<Configure>", self.on_canvas_configure)
        # self.Middle_frame.configure(scrollregion=(0, 0, 600, 2000))
        self.detect_button = tk.Button(self.Middle_frame, text="检测", command=self.detect_objects, width=30, height=2,
                                       pady=2)
        self.detect_button.grid(column=0, row=0, columnspan=15)

加油。