I use Nette Forms and Latte standalone. It works great.
Now I would like to use flash-messages in my form. Any hints on how to
achieve this would be much appreciated.
Flash messages implementation is in Nette\Application\UI\Presenter and is
quite complicated. You will have to replicate functionality yourself if you
don't want to use nette/application
Thanks, I found this package that works very well: https://tamtamchika.net/simple-flash/