[Python] Changing pysimplegui.Combo displayed value from code, not user

I am trying to create a drop-down list that whose value is saved at the press of a button (my actual application uses multiple drop-downs and a single Apply). I also want a Reset button to discard changes made since last hitting Apply. How can I go back and edit the displayed value of sg.Combo?

Example Code:

import PySimpleGUI27 as sg # NOTE: If using python3, delete '27'

if __name__ == "__main__":
data = '' # Stored data
layout = [
[sg.Combo(['', 'opt1', 'opt2', 'opt3'], key='_key_'), sg.Button('Apply')],
[sg.Button('Reset'), sg.Button('Exit')]
]
window = sg.Window('Minimum Example', layout)

while True:
event, value = window.read()
if event == 'Exit':
break
elif event == 'Apply': # set 'data' to the sg.Combo value
data = value['_key_']
elif event == 'Reset': # set sg.Combo value to 'data'
# This is where my question is focused.
# How can I change the displayed drop-down back to
# whatever is saved in 'data'?
window['_key_'].Update(value=data) # <---- Answer
if value is None:
break # Value is None, window is probably closed

window.close()

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