Python can't add canvas to ttk notebook page

Question

from tkinter import *
from tkinter import ttk

class MainGame(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)   
        self.parent = parent        
        self.initUI()

    def initUI(self):
        global canvas
        # ===Part A ===
        self.parent.title('PythonPage')
        self.pack(fill = BOTH, expand = 1)
        self.page = ttk.Notebook(self, width = 650 ,height = 630)
        self.page1 = ttk.Frame(self)
        self.page.add(self.page1, text = 'Tab1')
        self.page.pack(expand = 1, anchor = 'nw', side = 'top')
        # ===Part B ===            
        canvas = Canvas(self)
        canvas.create_rectangle([10,10, 650,630], fill = 'blue')
        canvas.pack(fill = BOTH, expand = 1)
        canvas.update()
        self.a = Label(self, text = 'Haha')
        self.a.place(x=50,y=50)

root = Tk()
root.geometry('925x650')
main = MainGame(root)
root.mainloop()

How can I add my rectangle into ttk's notebook? I found that my rectangle is always created below the notebook, but this situation is not the same with Label.

I want to put the rectangle inside the notebook, should I add something to self.page1?.

Answer 1

If you want the canvas to be in the notebook, you must add it to one of the notebook pages. For example, if you want it in self.page, you would change this line:

canvas = Canvas(self)

... to this:

canvas = Canvas(self.page1)