Thanks, Rick, but that's not really what I am looking for. I'm not trying to test whether the user is editing their photomatch (i.e. adjusting vanishing points, origin, etc.). I just want to know if the user has selected a photomatch scene tab and has not changed the camera view (photo background is still in view). The active tool could be anything (select, linetool, pushpull, etc, I don't care).
In other words, I just want to test if the photomatch background is still in view. There doesn't seem to be anything in the RenderingOptions, Page, or Camera classes to help me here.