How to work with multiple windows in Tkinter - python-3.x

Question

I want to have 2 tkinter Windows. On the main Window there should be a button which opens a new window and closes the original one. Below you can see my minimal Code example.
So far the first window opens but as soon as I push the button both windows just close.
Please tell me what my specific error is int this code?
Is there a way to emprove my code?(general tips)?
.
def Func_Show_Rep(self):
#destroy main window
Cockpit_Win.quit()
Cockpit_Win.destroy()
# Open new Window
ReportSelection_Win = Toplevel()
ReportSelection_Win = Tk()
#create the main window
Cockpit_Win = Tk()
Btt_Show_Rep = Button(Cockpit_Win, text="Reports", width=35)
Btt_Show_Rep.bind("<Button-1>",Func_Show_Rep)#Button click starts function
Btt_Show_Rep.grid(column=1, row=2, padx=10, pady=7, sticky=E)
#Make the windows stay (loop)
Cockpit_Win.mainloop()

Answer 1

You cannot have a TopLevel window when the root window is destroyed with Tkinter. The TopLevel window is built on top of the root window.
If you want to destroy (effectively hide) the Cockpit_Win window, use the following:
Cockpit_Win.withdraw()
When you want to make it visible again, use:
Cockpit_Win.deiconify()
The entire code looks like this:
def Func_Show_Rep(self):
# Open new Window
ReportSelection_Win = Toplevel()
#ReportSelection_Win = Tk() # This is the same as the previous statement
#destroy (effectively hide) main window
Cockpit_Win.withdraw()
#create the main window
Cockpit_Win = Tk()
Btt_Show_Rep = Button(Cockpit_Win, text="Reports", width=35)
Btt_Show_Rep.bind("<Button-1>",Func_Show_Rep)#Button click starts function
Btt_Show_Rep.grid(column=1, row=2, padx=10, pady=7, sticky=E)
#Make the windows stay (loop)
Cockpit_Win.mainloop()