silverlight2 Message class missing CreateBufferedCopy method

Question

I am trying to read a soap response twice and I got the error message already read ... There are some examples how to avoid this BUT ... they are using the CreateBufferedCopy method and I cannot find it on the silverlight2 Message object:

Microsoft has also this sentence in the silverlight doc :

http://msdn.microsoft.com/en-us/library/system.servicemodel.channels.message.getreaderatbodycontents(VS.95).aspx "If you want to access the body multiple times, use CreateBufferedCopy(Int32) to create a MessageBuffer instance."