Python: Tkinter open custom widget in new window

Question

My aim is to generate a window with a button "NewWindow" on it. If I press the button, the program should open a new window. This window I stored in a class "NewWindow" to quickly reproduce it. In this "NewWindow" I have another button. If I press it the label of basic window should be updated and the window "NewWindow" should be closed automatically.

Here is my code:

from tkinter import *

class NewWindow(Toplevel):
    def __init__(self, master = None):
        super().__init__(master = master)
        self.title('NewWindow')

        self.lb = Label(self, text='Hello')
        self.lb.grid(column=0, row=0, columnspan=1)

        self.bt1 = Button(self, text="apply Hello", command= self.bt_press)
        self.bt1.grid(column=0, row=1)
    def bt_press(self):
        window.basic_lb.text = "Hello"

window = Tk()

def new_Editor():
    a = NewWindow(window)

window.title("BasicWindow")
window.basic_lb = Label(window, text='None')
window.basic_lb.grid(column=0, row=0, columnspan=1)

window.basic_bt = Button(window, text="NewWindow", command=new_Editor)
window.basic_bt.grid(column=0, row=1)


window.mainloop()

Problems:

1. At start both windows NewWindow and BasicWindow are displayd. I only want to open BasicWindow and NewWindow should be opened after button basic_bt is clicked. How can I solve it? (already solved by commed below)
2. Why the label text in basic_lb did not get some update after pressing self.bt1?
3. How is it possible to close NewWindow with use of bt_press method?