Ok, now on Flex Builder memory profiler again.
It has Object References view which is supposed to show me which objects are holding my particular one from being garbage collected.
Let’s take a look what it shows me from time to time:
It tells me “expand to see references” but there is nothing to expand. Bitches 
When you start profiling, a popup should appear (Configure Profiler)
You need to select “Generate object allocation stack traces” for the feature.
(Just adding this comment, incase other ppl are led here by some search)
Hi McUsher,
thank you for the comment.
Maybe I really forgot to check that tick.
Sincerely,
Alex