[PySimpleGUI] Tutorial - Name, Address, Phone GUI

[jfong]

After the form shows up, I make a Combobox selection and press Submit button, an error comes out as listed below. (Although the followed MsgBox has correct content and can be closed normally)

C:\Works\Python\PySimpleGUI-master>py
Python 3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 19:28:18) [MSC v.1600 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import Demo_Recipes
>>> Demo_Recipes.Everything()
can't invoke "winfo" command: application has been destroyed
while executing
"winfo exists $w"
(procedure "ttk::entry::AutoScroll" line 3)
invoked from within
"ttk::entry::AutoScroll .42053744.42054352"
(in namespace inscope "::" script line 1)
invoked from within
"::namespace inscope :: {ttk::entry::AutoScroll .42053744.42054352}"
("uplevel" body line 1)
invoked from within
"uplevel #0 $Repeat(script)"
(procedure "ttk::Repeat" line 3)
invoked from within
"ttk::Repeat"
("after" script)
>>>