Converting display options to checkboxes - WIP

[thundernixon]

I'm trying to change the "Display" options from a segmented control to individual checkboxes.

I've found that the current UI control is using a vanilla SegmentedButton, and this is sending a number to a callback function which sets display options based on the segmented selection. So, I think I need to make three individual vanilla checkBoxes, and let them call the same function, but send a title or integer when their value is True.

However, I'm currently stuck. Even when simply trying to make a single checkbox and print it's sender value from the callback, I get the following error message:

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Installing 'mirroringPane' report:
  Traceback (most recent call last):
      File "mirroredBackground.py", line 353, in <module>
      File "mirroredBackground.py", line 36, in __init__
      File "mirroredBackground.py", line 71, in initUI
      File "/Applications/RoboFont3.3b.app/Contents/Resources/lib/python3.6/vanilla/vanillaCheckBox.py", line 75, in __init__
      File "/Applications/RoboFont3.3b.app/Contents/Resources/lib/python3.6/vanilla/vanillaCheckBox.py", line 83, in set
    ValueError: depythonifying 'long long', got 'str' of 5
  
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I'm not quite sure where to go from here, except ... to bed, for now. I'll pick this up again later. :) In the meantime, I would love to get a pointer as to what I might be missing, here.