Modified par file overwrites original one (Portal DC)

Hi,

I'm trying to modify the masthead par file delivered by SAP using NWDI. I want to create it under our namespace so that it doesn't overwrite the original one but I don't see how to do it.

Here's what I've done so far: I created a Development Component of type "Enterprise Portal - Portal Application Standalone" and included the existing .par file. This DC is created with our own name prefix, and under a Software Component having our own vendor name. I changed the code, then DC Build, DC Deploy. Then when I access the portal I see the original masthead has been overwritten with my changes. It is always named com.sap.portal.navigation.masthead

Is there a way to change this name so that it doesn't clash with the original one? I've check in the portalapp.xml but it's not there, any idea?

Thanks,

Martin