Derriving a class from a .NET component

[wra]

All,

I am using Ea 6.5 build 806.  I have created a class "BasicException" that I want to derrive from .NET's Exception class.

I also need to include the System.Collections namespace in the model.

My questions are:

1.  How do I create the BasicException subclass without placing the Exception class in the model?

2.  How do I place the "using System.Collections" name space in the model or do I need to edit the source code directly?