Hi Ditto - MoI avoids putting that "choose one object" pop up menu on selections because it tends to be something that pops up all the time, kind of a constant irritating distraction.

In MoI the main way to select hidden objects is to just hide the object that is obscuring them so that they are no longer hidden.

Or sometimes a strategic window select can do the job, see here for some examples:

http://moi3d.com/forum/index.php?webtag=MOI&msg=1810.2
http://moi3d.com/forum/index.php?webtag=MOI&msg=3324.4


Also selecting visible objects and doing an invert of the selection can sometimes be a good way to do it.

- Michael