[Lazarus] How to detect that the Alt-key is released?

[Jürgen Hestermann]

Am 2015-08-02 um 14:33 schrieb JuuS:
> (btw. this WON'T work in onkeyup with just the alt key...when you lift
> alt (ie, keyup) it is no longer down and so is not in "Shift", to see it
> work do something like alt-a).

But that's just what I want:
Detect the release of the Alt+key (independend from other keys state).

So it's not possible?