Subinterfaces info

Hi,

I have 7304 cisco router with the subinterfaces on it configured for netflow:
...
!
interface GigabitEthernet 2
no ip address
ip flow ingress
!
interface GigabitEthernet 2.10
ip address a.a.a.a b.b.b.b
ip flow ingress
!
interface GigabitEthernet 2.20
ip address x.x.x.x y.y.y.y
ip flow ingress
!
ip flow-export source <interface>
ip flow-export version 5
ip flow-export destination <IP of NetFlow machine & port>
!
...

however Netflow analyzer shows GigabitEthernet2 and there is no 2.10 or 2.20 subinterfaces available. In a mean time on cisco itself show ip cashe flow shows all the subinterfaces. Could you please help/instruct how to have separate subinterfaces information showed at Netflow Analyzer 5?

Thanks