TreeView is designed as an afterthought. Some manager at MICROS~1 was like 'ah yes we need an expanding nested list widget by tomorrow' and they mutilated text edit box to draw text lines that expand when you click them. It does not have keyboad focus. It can only be operated with a mouse. It does not have shadow or raised widget borders. It has black text on white background, while every other widget has Windows Gray background.

The proper UI would be a separate button for each label, like multiple hierarchical combo boxes.

[–] WesternInfidels@feddit.online 2 points 1 day ago* (last edited 1 day ago)

Windows tree views do have keyboard controls, although they're weird and opaque and I didn't know what all of them were, either.