Tkinter Window too small - python-3.x

Question

My kinter window is coming to small even after using geometry.
What to do so that it doesn't shrink?
Here's my code. And I can see the minimize button is coming towards left of the window. but I don't know ... why does this happen? I want to achieve oop for tkinter.
from logging import root
from tkinter import *
import tkinter as tk
from tkinter import messagebox
import mysql.connector
from tkinter import ttk
# from com.acc.report.database import
class Main(tk.Tk):
def __init__(self):
super().__init__()
# if not tasks:
# self.tasks = []
# instance of tkinter frame, i.e., Tk()
# root = Tk()
style = ttk.Style()
style.map("C.TButton",
foreground=[('pressed', 'red'), ('active', 'blue')],
background=[('pressed', '!disabled', 'black'), ('active', 'white')]
)
# width = self.winfo_screenwidth()
# height = self.winfo_screenheight()
self.geometry("626x431")
def selectReports():
messagebox.showinfo("EDP", "All reports")
def showReports():
messagebox.showinfo("EDP", "Select reports")
#Report Display Window
# def reviewReport():
# win = Toplevel(root)
# win.geometry("626x431")
monitor = ttk.Button(name="",text="Monitor",command=showReports,style="C.TButton")
review = ttk.Button(name="",text="Review",command=selectReports,style="C.TButton")
monitor.pack(pady=100)
review.pack(pady=0)
# Main method
if __name__ == "__main__":
objectMain = Main()
objectMain.withdraw()
objectMain.mainloop()

Answer 1

Make showReports and selectReports class methods, comment out or remove objectMain.withdraw() and everything should work.
from logging import root
from tkinter import *
import tkinter as tk
from tkinter import messagebox
#import mysql.connector
from tkinter import ttk
# from com.acc.report.database import
class Main(tk.Tk):
def __init__(self):
super().__init__()
self.geometry("626x431")
style = ttk.Style()
style.map("C.TButton",
foreground=[('pressed', 'red'), ('active', 'blue')],
background=[('pressed', '!disabled', 'black'), ('active', 'white')]
)
monitor = ttk.Button(name="",text="Monitor",command=self.showReports,style="C.TButton")
review = ttk.Button(name="",text="Review",command=self.selectReports,style="C.TButton")
monitor.pack(pady=100)
review.pack(pady=0)
def selectReports(self):
messagebox.showinfo("EDP", "All reports")
def showReports(self):
messagebox.showinfo("EDP", "Select reports")
# Main method
if __name__ == "__main__":
objectMain = Main()
# objectMain.withdraw()
objectMain.mainloop()