Problem with property of type CustomException which inherits
from Exception

I am trying to expose an object as a return of a webmethod. THe problem is this
obejct has a property named Error which is of type CustomError which in turn
inherits from System.Exception. My question is there any way to hide this
property from the serizalizer so I don't get this error? I was able to implement
it on the local field [NonSerialable] but not on the property. 

ANy ideas? THanks,