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Automatically show Window after EyeLink set up

I created a simple eyperiment with EyeLink and PsychoPy using the ioHub on Windows 10.
the setup procedure works just fine, yet the I can only resume the experiment, if I manually select the PsychoPy screen after exiting the setup procedure.

This is what I am doing currently:

win.winHandle.minimize() #minimize the PsychoPy window
win.fullscr = False # disable fullscreen
win.flip() 

r = tracker.runSetupProcedure() # run eyetracker calibration

win.winHandle.maximize()
win.fullscr = True
win.winHandle.activate()
win.flip()

Is there a possibility to automatically open the Experiment window after the Eyetracker has been set up?
I tried also the following https://stackoverflow.com/questions/26257490/psychopy-reopen-window and https://groups.google.com/forum/#!topic/psychopy-users/aq3XgtuWeiI
Nothing seems to work…

Thank you for any ideas!