Screenshot from 2021-11-16 15-10-07.png

It has an

isError

property, but that really only sets the colors of the TextField decorations. But you can stick an

Icon

or

IconButton

into

trailingIcon

, which, when clicked, opens a

Popup

, or any other content you need to rebuild that mechanism yourself

Yes I think this feature of TextField didn't make it for stable. Not sure if it's slated for 1.2.