I am creating different cameras for different views for an add-in.  I can successfully change between cameras by assigning them to the ModelView.Camera.

But when I try to set the aspect ratio of the camera, I get an exception stating that the  "method or operation is not implemented".  Does anyone know if this is a bug?  Or am I doing something wrong?

The problem is that the camera viewport does not fill the entire document window, since the aspect ratio of the camera does not match that of the window.