Modifing genereted Client stub class

[Asma Maalej]

Hi

In order to add a custom block header to the SOAP message, i want to 
keep the SOAP header sent by the client or the server side, and prevent 
the system to delete it.

So that, i thought to modify in the core of the genereted client Stub, 
may be it can resolve the problem

if someone has any idea how to do this, please tell me, and i would be 
soo grateful

thank you