Hi Marco, there isn't any way set up to cycle between overlapping objects, the main way to select stacked up objects that are occupying the same space is to click on them which will select one of them and if that is not the one you want, hide that one so it won't be in your way anymore and you can then select the remaining one.

I had previously done a cycling method for Rhino and I've come to view that as a mistake because it pops up very frequently and becomes irritating, so I've avoided that with MoI.

If you want to select all the stacked up objects at once, then do a window select instead of clicking. A window selection where you start on the right and move your mouse towards the left will have a dashed outline and will select any objects that cross the window, so you can do it on a small area where there aren't other objects around it.

- Michael