This implementation suffers at least from 2 problems:
1. It doesn't support icons at all.
2. It toggles the checkbox when clicking on the text and not just on the
checkbox itself, as would be expected.
but it's still better than the current version which simply doesn't work
at all, i.e. can't be toggled in any way (and also doesn't draw itself
correctly when using dark mode under macOS 10.14+), so use it for now.
A better solution would be to fix the problem with ActivateCell() not
working at all (see #17746) and update the code to respect drawing in
dark mode.
Closes#17473.
Closes https://github.com/wxWidgets/wxWidgets/pull/904
235e61c311