COM+ package Dllhost.exe not shutting down

COM+ package Dllhost.exe not shutting down after idle shutdown time - I have
an two enterprise components(.NET) A (req txn) , B (not supported txn)
hosted within com+ .
Base client invokes the A and A inturn invokes the B .
With in A i explicitly call Setabort .
In this situation the package B after idle shut down time goes down but the
Package A after idle shut down time is still alive .

Can some body help me on this ?