I got the following problem:
I have an actionscript class that receives different smaller GUI-parts that have been created as own MXML components. Since I do not know how to forward complete MXML components I declare them "as Panel" and send them to main application.
However I need to apply several listeners to these GUI-elements (as I would like to use them)...so how can I access them? Whenever I try to access the subgroups of the incoming MXML-files FlashBuilder just says that that property is unknown.
Should have done the tutorials more extensively. This was quite an easy issue.