WCF Custom Operation Behaviour Implementation Order -

i have 2 custom operation behaviours validates , input , token separately, work fine, want them implemented in particular order.

i'd requiredrequestvalidate gets called before requiredtoken not case atm.

what have is:

[requiredrequestvalidate] [requiredtoken] public usersresponse getusers(userauthorizationrequest request) {      // whatever here ... }