From Xojo Documentation
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To facilitate the automatic support of Dark Mode in macOS 10.14 Mojave, there are some subtle changes to how default colors work.
- Controls whose text defaults to Solid Black (&c00000000) will automatically use the system's Text Color (except Label, see below), which changes depending on Light or Dark mode.
- Controls whose background color defaults to Solid White (&cFFFFFF00) will automatically use the system's Text Background Color, which changes depending on Light or Dark Mode.
- When painting to a Graphics context (such as in a Canvas), TextColor returns the system Text Color, FillColor returns the system's Window Fill Color and FrameColor now uses the system's Control Color.
- Labels whose TextColor is set to Solid Black (&c000000) will automatically use the system's Label Color so they automatically match the captions on Checkboxes and Radio buttons and change depending on light/dark mode.
Lastly, there is a new global method called sDarkMode which returns True if the system is running in Dark Mode on macOS Mojave. It currently always returns False on Windows and Linux.