[Tkinter] problem with refresh UI in tkinter app

[Philbot]

Hi
I am not sure I am approaching this the best way but I require a 2 page UI one that the users can use to select buttons whos names are controlled by the user and do various other things as part of the program.
There are alot of buttons to control but I have used 2 as an example in the code below.
Basically I am saving the data to a pickle file so when the user opens the app it will get the data based on the last session settings via the ini file.

The setup page is to allow the user to change these button names then save them to the pickle file but what I am looking for is for the app to save to pickle file and then update the userpage when they move back to the userpage without having to re-start the program.

Ive looked at refresh and idle but it does not seem to work or I have been putting it in the wrong place.

Any help will be appreciated

Thanks

import tkinter as tk                # python 3
from tkinter import font  as tkfont # python 3
import pickle

#on app open load previous pickle file data (this loads all my previous settings)
def loaddata():
    with open('sender2_ini.pkl', 'rb') as f:
        Mydata = pickle.load(f)
        return Mydata

Mydata = loaddata()

class MainApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        self.title('Userpage')

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        for F in (Userpage, Setup):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame

            # put all of the pages in the same location; the one on the top of the stacking order
            # will be the one that is visible.
            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame("Userpage")

    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame = self.frames[page_name]
        frame.tkraise()

    def capture_asset(self):
        print("get the name of button pressed and store global variable for later use")

class Userpage(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent, background="#b22222")
        self.controller = controller
        Mydata = loaddata()
        data1 = tk.StringVar(value=Mydata[0])
        data2 = tk.StringVar(value=Mydata[1])

        button1 = tk.Button(self, textvariable =data1, width=8)
        button1.grid(row=2, column=1, padx =5, pady =5)
        button2 = tk.Button(self, textvariable = data2, width=8)
        button2.grid(row=2, column=2, padx =5, pady =5)
        button3 = tk.Button(self, text="Setup", command=lambda: controller.show_frame("Setup"))
        button3.grid(row=6, column=3)

class Setup(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent, width=500, height=500, background="bisque")
        self.controller = controller
        self.Mydata = loaddata()

        data1 = tk.Entry(self, textvariable = tk.StringVar(value=self.Mydata[0]))
        data1.grid(row=4, column=0)
        data2 = tk.Entry(self, textvariable = tk.StringVar(value=self.Mydata[1]))
        data2.grid(row=4, column=1)

        def setup_update():
            Mydata = [data1.get(), data2.get()]
            with open('sender2_ini.pkl', 'wb') as f:
                pickle.dump(Mydata, f)

        SaveButton = tk.Button(self, text='Save', width=25, command = setup_update)
        SaveButton.grid(row=5, column=0)

        senderbutton = tk.Button(self, text="Back to Userpage", command=lambda: controller.show_frame("Userpage"))
        senderbutton.grid(row=8, column=0)

if __name__ == "__main__":
    app = MainApp()
    app.mainloop()