Button has a Group, but is not a subclass of Group

[dhalbert]

JMK expected a Button to act like a Label, in that it would be a Group that you would add to a Group. But Button is not a subclass of Group: It has a Group (.group), but it is not itself one.

There is a mirrored page in Learn Guides with an example that assumes a Button is a Group:
https://learn.adafruit.com/pyportal-calculator-using-the-displayio-ui-elements/ui-quickstart#button-3-15
https://learn.adafruit.com/circuitpython-display-support-using-displayio/ui-quickstart

Is it possible for it to be Group? If not, the examples should be fixed, and the documentation here should explain how to use .group.

Tagging @makermelissa @tannewt @ladyada

[ladyada]

i vaguely recall there was a reason i had to do it this way, like it wasnt working to make it a group subclass, but im almost sure its been fixed now.
@makermelissa wanna try makin' it a group? it will either Totally Work or you'll bump into the thing i did.

[makermelissa]

Sure, I can give it a try.

[tannewt]

Yup, it used to not work but now it should.