OOTB Inheritance & Compile into a separate assembly

Hi,

I created a class UsrAccountAddressEventListener in my package. I want this class to inherit OOTB AccountAddressEventListener (Package CrtCustomer360App, assembly CrtCustomer360App.dll, Namespace Terrasoft.Configuration.CrtCustomer360App).

But because CrtCustomer360App is configured with Compile into a separate assembly, I cannot add a using Terrasoft.Configuration.CrtCustomer360App without a compilation error.

What can I do to fix this ?