Object Test Bench in VS.NET 2005

I am not sure how many of you are aware of the object test bench in VS.NET 2005. This allows you to graphically create an instance from a class(object) in your class diagram and execute its methods visually.
Invoking it is as simple as creating a class diagram and dropping your classes there. Then you can right click on a class and go to create instance and invoke a constructor. This will create an instance object and place it in the object test bench. You can right click on this object and invoke instance methods.This is really useful if you need to create, invoke and test objects in isolation.