Force Wireshark to decode part of Data as another protocol

[Rayne <hjazz6 () ymail com>]

Hi all,

I have some traffic samples where the Layer 2 is PPP and the next protocol field value is 0x0281, which indicates MPLS 
Unicast. There are 4 bytes following this PPP 
header before I see the IP header. However, Wireshark has decoded 
everything after the PPP header as Data. I can't choose the "Decode As" 
option in this case, as it is greyed out. How can I force Wireshark to decode the 4 bytes 
after the PPP header as something else, say MPLS in this case?

Thank you.

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