Having problem using tkinter to collect data and send to AddEmployeeManually class

[leahakbashev]

import tkinter
from tkinter import ttk

window = tkinter.Tk()
window.title("Employees Management Form")
window.geometry('600x600')
window.configure(background="white");

class EmployeeForm():

    def __init__(self):
        #labels for the Entries
        lblName = ttk.Label(window, text="Name").grid(row=0, column=0)
        lblId = ttk.Label(window, text="Id").grid(row=1, column=0)
        lblPhone = ttk.Label(window, text="Phone Number").grid(row=2, column=0)
        lblAge = ttk.Label(window, text="Age").grid(row=3, column=0)
        #Entries
        self.name = ttk.Entry(window).grid(row=0, column=1)
        self.id = ttk.Entry(window).grid(row=1, column=1)
        self.phone = ttk.Entry(window).grid(row=2, column=1)
        self.age = ttk.Entry(window).grid(row=3, column=1)
        #Submit Button
        self.button = ttk.Button(window, text="Submit", command=self.on_button()).grid(row=4, column=1)

    #when Submit is press the data is sent to Add Empl manually class
    def on_button(self):
        employee = AddEmployeeManually(self.name, self.id, self.phone, self.phone)
        employee.setData()
        window.mainloop()

class AddEmployeeManually():
    def __init__(self, name, id, age, phone):
        self.name = name
        self.phone = phone
        self.age = age
        self.id = id

    def setData(self):
        employees = open('Employees.txt', 'a')
        try:
            employees.write(self.id)
            employees.write(self.name)
            employees.write(self.phone)
            employees.write(self.age)
            employees.write('\n')
        except:
            print('Error!')

def main():
    choice = int(input("Please type: 1 to Add Employee Manually, 2 to Add from file and 3 to Delete Employee: \n"))
    if choice == 1:
        chosen = EmployeeForm()
    elif choice == 2:
        print("File import needs to be build!")
    elif choice == 3:
        print("Delete class needs to be build!")
    else:
        print ("Not correct choice!")
if __name__ == "__main__":
    main()

[dwblas]

First, you must format you code in code tages so it can be read. Edit your post and format the code to get any help. Second do you have a specific problem? "Having problem using tkinter" is too vague to respond to. I did happen to notice

self.name = ttk.Entry(window).grid(row=0, column=1)

grid() returns None to self.name will always be None. Print it to see for yourself. Am not willing to guess further about what other problems you are having or how your code is formatted.