In the code below if I do not use pack() the widgets do not show but grid and pack are not supposed to be used in the same class. How to write this correctly without using pack?

In the code below if I do not use pack() the widgets do not show but grid and pack are not supposed to be used in the same class. How to write this correctly without using pack?

import customtkinter as ctk import pandas as pd from tkinter import filedialog, messagebox import threading # Função para carregar e exibir o arquivo Excel def load_excel(): file_path = filedialog.askopenfilename(filetypes=[(“Excel files”, “*.xlsx”)]) if file_path: global df df = pd.read_excel(file_path) if ‘Matrículas’ in df.columns: display_table(df) else: messagebox.showerror(“Erro”, “O arquivo selecionado não segue o padrão esperado.”) # Função para exibir os dados na Treeview def display_table(df): for i, row in df.iterrows(): tree.insert(“”, “end”, values=list(row)) # Função para validar e destacar matrículas inválidas def validate_data(): for i, item in enumerate(tree.get_children()): matricula = tree.item(item)[‘values’][0] if len(str(matricula)) != 5 or not str(matricula).isdigit(): tree.item(item, tags=(“invalid”,)) else: tree.item(item, tags=(“valid”,)) tree.tag_configure(‘invalid’, background=’red’) tree.tag_configure(‘valid’, background=’white’) # Função para atualizar o DataFrame e salvar o arquivo corrigido def update_and_save(): for i, item in enumerate(tree.get_children()): df.iloc[i, 0] = tree.item(item)[‘values’][0] # Assumindo que a coluna de matrículas é a primeira df.to_excel(“corrected_file.xlsx”, index=False) messagebox.showinfo(“Sucesso”, “Arquivo salvo com sucesso!”) # Configuração da interface CustomTkinter app = ctk.CTk() app.geometry(“800×600″) load_button = ctk.CTkButton(app, text=”Carregar Arquivo”, command=load_excel) load_button.pack(pady=20) tree = ctk.CTkTreeview(app, columns=(“Matrícula”,)) tree.heading(“#0″, text=””) tree.heading(“Matrícula”, text=”Matrícula”) tree.pack(pady=20) validate_button = ctk.CTkButton(app, text=”Validar Matrículas”, command=validate_data) validate_button.pack(pady=20) save_button = ctk.CTkButton(app, text=”Salvar Correções”, command=update_and_save) save_button.pack(pady=20) app.mainloop()

I call another form with this one, and the listboxes of the second form are either not displayed when I add the self.destroy(), in the function where it is displayed in two forms when I remove the line. Do you have any clues? I have been looking for days but have found nothing.

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