Thanks for the answer.
Regarding to your idea - I was sure I can execute the debugger only via "perl -d", but since you reffered as if it is possible other way I looked again.

From "perldebguts" under "Debugger Internals":
"These mechanisms are enabled by calling Perl with the -d switch."
It seems that the sub DB::DB is not executed unless you use the "-d" flag.
Do I miss something here ???

Thanks,
shushu