Now I'd like for instance use methods of first mentioned object instance in second mentioned object.
I tried simply by sending object A instance as parameter to method of object B and call method but it seems it doesn't work....

$A->methodfoo($B); # methodfoo will call $_[1]->methodbar();

Could you post a cut-down example of your code that still exhibits the problem? Also, please remember to read Writeup Formatting Tips.

-David